diff --git a/homework4/starting_point/.idea/workspace.xml b/homework4/starting_point/.idea/workspace.xml
index 755d3ed..d536772 100644
--- a/homework4/starting_point/.idea/workspace.xml
+++ b/homework4/starting_point/.idea/workspace.xml
@@ -1,652 +1,651 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="CMakeRunConfigurationManager" shouldGenerate="true" shouldDeleteObsolete="true" buildAllGenerated="true">
     <generated>
       <config projectName="Particles" targetName="particles" />
       <config projectName="Particles" targetName="test_kepler" />
       <config projectName="Particles" targetName="test_fft" />
       <config projectName="Particles" targetName="part" />
     </generated>
   </component>
   <component name="CMakeSettings">
     <configurations>
       <configuration PROFILE_NAME="Debug" CONFIG_NAME="Debug" />
     </configurations>
   </component>
   <component name="ChangeListManager">
     <list default="true" id="b4e9d45a-71a7-4f96-94b1-4bcb4ac5e568" name="Default Changelist" comment="">
       <change beforePath="$PROJECT_DIR$/CMakeLists.txt" beforeDir="false" afterPath="$PROJECT_DIR$/CMakeLists.txt" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/compute_temperature.hh" beforeDir="false" afterPath="$PROJECT_DIR$/compute_temperature.hh" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/py_part.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/py_part.cpp" afterDir="false" />
     </list>
     <ignored path="$PROJECT_DIR$/cmake-build-debug/" />
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="TRACKING_ENABLED" value="true" />
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
     <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
     <option name="LAST_RESOLUTION" value="IGNORE" />
   </component>
   <component name="FUSProjectUsageTrigger">
     <session id="-631948752">
       <usages-collector id="statistics.lifecycle.project">
         <counts>
           <entry key="project.open.time.4" value="1" />
           <entry key="project.opened" value="1" />
         </counts>
       </usages-collector>
       <usages-collector id="statistics.file.extensions.open">
         <counts>
           <entry key="cc" value="13" />
           <entry key="cpp" value="1" />
           <entry key="hh" value="14" />
           <entry key="txt" value="1" />
         </counts>
       </usages-collector>
       <usages-collector id="statistics.file.types.open">
         <counts>
           <entry key="CMakeLists.txt" value="1" />
           <entry key="ObjectiveC" value="28" />
         </counts>
       </usages-collector>
       <usages-collector id="statistics.file.extensions.edit">
         <counts>
           <entry key="cpp" value="615" />
           <entry key="txt" value="201" />
         </counts>
       </usages-collector>
       <usages-collector id="statistics.file.types.edit">
         <counts>
           <entry key="CMakeLists.txt" value="201" />
           <entry key="ObjectiveC" value="615" />
         </counts>
       </usages-collector>
       <usages-collector id="statistics.cidr.testingFrameworks.usages">
         <counts>
           <entry key="Google Test" value="3" />
         </counts>
       </usages-collector>
     </session>
     <session id="-1660580526">
       <usages-collector id="statistics.lifecycle.project">
         <counts>
           <entry key="project.closed" value="1" />
           <entry key="project.open.time.5" value="1" />
           <entry key="project.opened" value="1" />
         </counts>
       </usages-collector>
     </session>
   </component>
   <component name="FileColors">
     <fileColor scope="All" color="ffffff" />
   </component>
   <component name="FileEditorManager">
     <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
       <file leaf-file-name="CMakeLists.txt" pinned="false" current-in-tab="true">
         <entry file="file://$PROJECT_DIR$/CMakeLists.txt">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="266">
+            <state relative-caret-position="538">
               <caret line="80" lean-forward="true" selection-start-line="80" selection-end-line="80" />
             </state>
           </provider>
         </entry>
       </file>
       <file leaf-file-name="main.py" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/main.py">
           <provider selected="true" editor-type-id="text-editor">
             <state relative-caret-position="118">
               <caret line="36" column="51" lean-forward="true" selection-start-line="36" selection-start-column="51" selection-end-line="36" selection-end-column="51" />
               <folding>
                 <element signature="e#20#30#0" expanded="true" />
               </folding>
             </state>
           </provider>
         </entry>
       </file>
       <file leaf-file-name="py_part.cpp" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/py_part.cpp">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="426">
-              <caret line="62" column="98" selection-start-line="62" selection-start-column="98" selection-end-line="62" selection-end-column="98" />
+            <state relative-caret-position="351">
+              <caret line="59" column="11" selection-start-line="59" selection-start-column="11" selection-end-line="59" selection-end-column="11" />
             </state>
           </provider>
         </entry>
       </file>
       <file leaf-file-name="compute_temperature.hh" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/compute_temperature.hh">
           <provider selected="true" editor-type-id="text-editor">
             <state relative-caret-position="315">
               <caret line="21" column="17" lean-forward="true" selection-start-line="21" selection-start-column="17" selection-end-line="21" selection-end-column="17" />
             </state>
           </provider>
         </entry>
       </file>
       <file leaf-file-name="planets_factory.hh" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/planets_factory.hh">
           <provider selected="true" editor-type-id="text-editor" />
         </entry>
       </file>
       <file leaf-file-name="system_evolution.hh" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/system_evolution.hh">
           <provider selected="true" editor-type-id="text-editor">
             <state relative-caret-position="330">
               <caret line="23" column="37" lean-forward="true" selection-start-line="23" selection-start-column="37" selection-end-line="23" selection-end-column="37" />
             </state>
           </provider>
         </entry>
       </file>
       <file leaf-file-name="material_points_factory.hh" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/material_points_factory.hh">
           <provider selected="true" editor-type-id="text-editor">
             <state relative-caret-position="365">
               <caret line="39" lean-forward="true" selection-start-line="39" selection-end-line="39" />
               <folding>
                 <element signature="e#1200#1215#0" expanded="true" />
               </folding>
             </state>
           </provider>
         </entry>
       </file>
     </leaf>
   </component>
   <component name="Git.Settings">
     <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$/../.." />
   </component>
   <component name="IdeDocumentHistory">
     <option name="CHANGED_PATHS">
       <list>
         <option value="$PROJECT_DIR$/main.py" />
         <option value="$PROJECT_DIR$/../../../readme.md" />
-        <option value="$PROJECT_DIR$/py_part.cpp" />
         <option value="$PROJECT_DIR$/compute_temperature.hh" />
+        <option value="$PROJECT_DIR$/py_part.cpp" />
         <option value="$PROJECT_DIR$/CMakeLists.txt" />
       </list>
     </option>
   </component>
   <component name="JsBuildToolGruntFileManager" detection-done="true" sorting="DEFINITION_ORDER" />
   <component name="JsBuildToolPackageJson" detection-done="true" sorting="DEFINITION_ORDER" />
   <component name="JsGulpfileManager">
     <detection-done>true</detection-done>
     <sorting>DEFINITION_ORDER</sorting>
   </component>
   <component name="NodePackageJsonFileManager">
     <packageJsonPaths />
   </component>
   <component name="ProjectFrameBounds">
     <option name="x" value="1" />
     <option name="y" value="23" />
     <option name="width" value="1423" />
     <option name="height" value="716" />
   </component>
   <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
   <component name="ProjectView">
     <navigator proportions="" version="1">
       <foldersAlwaysOnTop value="true" />
     </navigator>
     <panes>
       <pane id="ProjectPane">
         <subPane>
           <expand>
             <path>
               <item name="Particles" type="b2602c69:ProjectViewProjectNode" />
               <item name="starting_point" type="462c0819:PsiDirectoryNode" />
             </path>
           </expand>
           <select />
         </subPane>
       </pane>
       <pane id="Scope" />
     </panes>
   </component>
   <component name="PropertiesComponent">
     <property name="WebServerToolWindowFactoryState" value="false" />
     <property name="last_opened_file_path" value="$PROJECT_DIR$" />
     <property name="nodejs_interpreter_path.stuck_in_default_project" value="undefined stuck path" />
     <property name="nodejs_npm_path_reset_for_default_project" value="true" />
     <property name="settings.editor.selected.configurable" value="editor.preferences.import" />
   </component>
   <component name="RunDashboard">
     <option name="ruleStates">
       <list>
         <RuleState>
           <option name="name" value="ConfigurationTypeDashboardGroupingRule" />
         </RuleState>
         <RuleState>
           <option name="name" value="StatusDashboardGroupingRule" />
         </RuleState>
       </list>
     </option>
   </component>
   <component name="RunManager" selected="Application.particles">
     <configuration name="test_fft" type="CMakeGoogleTestRunConfigurationType" factoryName="Google Test" PASS_PARENT_ENVS_2="true" PROJECT_NAME="Particles" TARGET_NAME="test_fft" CONFIG_NAME="Debug" RUN_TARGET_PROJECT_NAME="Particles" RUN_TARGET_NAME="test_fft" TEST_MODE="SUITE_TEST" />
     <configuration name="test_kepler" type="CMakeGoogleTestRunConfigurationType" factoryName="Google Test" PASS_PARENT_ENVS_2="true" PROJECT_NAME="Particles" TARGET_NAME="test_kepler" CONFIG_NAME="Debug" RUN_TARGET_PROJECT_NAME="Particles" RUN_TARGET_NAME="test_kepler" TEST_MODE="SUITE_TEST" />
     <configuration name="Build All" type="CMakeRunConfiguration" factoryName="Application" PASS_PARENT_ENVS_2="true" CONFIG_NAME="Debug" EXPLICIT_BUILD_TARGET_NAME="all" />
     <configuration name="part" type="CMakeRunConfiguration" factoryName="Application" PASS_PARENT_ENVS_2="true" PROJECT_NAME="Particles" TARGET_NAME="part" CONFIG_NAME="Debug" />
     <configuration name="particles" type="CMakeRunConfiguration" factoryName="Application" PASS_PARENT_ENVS_2="true" PROJECT_NAME="Particles" TARGET_NAME="particles" CONFIG_NAME="Debug" RUN_TARGET_PROJECT_NAME="Particles" RUN_TARGET_NAME="particles" />
     <list>
       <item itemvalue="Application.Build All" />
       <item itemvalue="Application.part" />
       <item itemvalue="Application.particles" />
       <item itemvalue="Google Test.test_fft" />
       <item itemvalue="Google Test.test_kepler" />
     </list>
   </component>
   <component name="SvnConfiguration">
     <configuration />
   </component>
   <component name="TaskManager">
     <task active="true" id="Default" summary="Default task">
       <changelist id="b4e9d45a-71a7-4f96-94b1-4bcb4ac5e568" name="Default Changelist" comment="" />
       <created>1545641844292</created>
       <option name="number" value="Default" />
       <option name="presentableId" value="Default" />
       <updated>1545641844292</updated>
       <workItem from="1545641847884" duration="14534000" />
       <workItem from="1547130688841" duration="12027000" />
     </task>
     <servers />
   </component>
   <component name="TestHistory">
     <history-entry file="test_fft - 2018.12.24 at 10h 50m 19s.xml">
       <configuration name="test_fft" configurationId="CMakeGoogleTestRunConfigurationType" />
     </history-entry>
     <history-entry file="test_fft - 2018.12.24 at 10h 59m 02s.xml">
       <configuration name="test_fft" configurationId="CMakeGoogleTestRunConfigurationType" />
     </history-entry>
     <history-entry file="test_fft - 2018.12.24 at 11h 03m 49s.xml">
       <configuration name="test_fft" configurationId="CMakeGoogleTestRunConfigurationType" />
     </history-entry>
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="36168000" />
+    <option name="totallyTimeSpent" value="36629000" />
   </component>
   <component name="ToolWindowManager">
     <frame x="1" y="23" width="1423" height="716" extended-state="0" />
     <editor active="true" />
     <layout>
       <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.22182596" />
       <window_info anchor="bottom" id="TODO" order="6" />
       <window_info anchor="bottom" id="Event Log" order="7" side_tool="true" />
       <window_info anchor="bottom" id="Version Control" order="7" />
       <window_info anchor="bottom" id="Run" order="2" weight="0.32852563" />
       <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
       <window_info anchor="bottom" id="Terminal" order="7" />
       <window_info id="Favorites" order="2" side_tool="true" />
       <window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
       <window_info anchor="bottom" id="CMake" order="7" weight="0.32852563" />
       <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
       <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
       <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.22519913" />
       <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
       <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
       <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
       <window_info anchor="right" id="Database" order="3" />
       <window_info anchor="bottom" id="Message" order="0" />
       <window_info anchor="bottom" id="Database Changes" order="7" show_stripe_button="false" />
       <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
       <window_info anchor="bottom" id="Find" order="1" />
       <window_info anchor="bottom" id="Messages" order="7" weight="0.32852563" />
       <window_info id="Favorites" order="2" side_tool="true" />
     </layout>
   </component>
   <component name="TypeScriptGeneratedFilesManager">
     <option name="version" value="1" />
   </component>
   <component name="VcsContentAnnotationSettings">
     <option name="myLimit" value="2678400000" />
   </component>
   <component name="editorHistoryManager">
     <entry file="file://$PROJECT_DIR$/../README.md">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="120">
           <caret line="8" lean-forward="true" selection-start-line="5" selection-end-line="8" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/material_points_factory.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="388">
           <caret line="39" lean-forward="true" selection-start-line="39" selection-end-line="39" />
           <folding>
             <element signature="e#1200#1215#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/CMakeLists.txt">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="178">
           <caret line="46" lean-forward="true" selection-start-line="46" selection-end-line="46" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/CMakeLists.txt">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="1440">
           <caret line="96" column="41" selection-start-line="96" selection-start-column="41" selection-end-line="96" selection-end-column="41" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/csv_writer.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="180">
           <caret line="12" column="12" selection-start-line="12" selection-start-column="12" selection-end-line="12" selection-end-column="30" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/system_evolution.cc">
       <provider selected="true" editor-type-id="text-editor">
         <state>
           <folding>
             <element signature="e#0#30#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/system_evolution.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="330">
           <caret line="23" column="37" lean-forward="true" selection-start-line="23" selection-start-column="37" selection-end-line="23" selection-end-column="37" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/py_part.cpp">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="105">
           <caret line="7" column="32" selection-start-line="7" selection-start-column="32" selection-end-line="7" selection-end-column="32" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/test_fft.cc">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="375">
           <caret line="25" column="35" selection-start-line="25" selection-start-column="35" selection-end-line="25" selection-end-column="35" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/fft.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="375">
           <caret line="25" column="1" selection-start-line="25" selection-start-column="1" selection-end-line="25" selection-end-column="1" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/planets_factory.cc">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="-423" />
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/planets_factory.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="-35" />
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/csv_writer.cc">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="-51" />
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/system_evolution.cc">
       <provider selected="true" editor-type-id="text-editor">
         <state>
           <folding>
             <element signature="e#0#30#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/ping_pong_balls_factory.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="58">
           <caret line="9" column="6" lean-forward="true" selection-start-line="9" selection-start-column="6" selection-end-line="9" selection-end-column="26" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/main.cc">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="321">
           <caret line="58" column="25" selection-start-line="58" selection-start-column="25" selection-end-line="58" selection-end-column="25" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/csv_writer.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="180">
           <caret line="12" column="12" selection-start-line="12" selection-start-column="12" selection-end-line="12" selection-end-column="30" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/CMakeLists.txt">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="433">
           <caret line="96" column="41" selection-start-line="96" selection-start-column="41" selection-end-line="96" selection-end-column="41" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/system_evolution.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="170">
           <caret line="23" column="37" lean-forward="true" selection-start-line="23" selection-start-column="37" selection-end-line="23" selection-end-column="37" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/compute_temperature.cc">
       <provider selected="true" editor-type-id="text-editor" />
     </entry>
     <entry file="file://$PROJECT_DIR$/compute_temperature.hh">
       <provider selected="true" editor-type-id="text-editor" />
     </entry>
     <entry file="file://$PROJECT_DIR$/compute.hh">
       <provider selected="true" editor-type-id="text-editor" />
     </entry>
     <entry file="file://$PROJECT_DIR$/material_points_factory.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="388">
           <caret line="39" lean-forward="true" selection-start-line="39" selection-end-line="39" />
           <folding>
             <element signature="e#1200#1215#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/material_points_factory.cc">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="33">
           <caret line="29" lean-forward="true" selection-start-line="29" selection-end-line="29" selection-end-column="16" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/particles_factory_interface.cc">
       <provider selected="true" editor-type-id="text-editor">
         <state>
           <folding>
             <element signature="e#0#41#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/particles_factory_interface.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="118">
           <caret line="8" column="33" lean-forward="true" selection-start-line="8" selection-start-column="33" selection-end-line="8" selection-end-column="33" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/main.py">
       <provider selected="true" editor-type-id="text-editor">
         <state>
           <folding>
             <element signature="e#20#30#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/py_part.cpp">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="418">
           <caret line="68" column="70" lean-forward="true" selection-start-line="68" selection-start-column="70" selection-end-line="68" selection-end-column="70" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/test_fft.cc">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="375">
           <caret line="25" column="35" selection-start-line="25" selection-start-column="35" selection-end-line="25" selection-end-column="35" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/fft.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="375">
           <caret line="25" column="1" selection-start-line="25" selection-start-column="1" selection-end-line="25" selection-end-column="1" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/planets_factory.cc">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="-423" />
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/csv_writer.cc">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="-51" />
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/system_evolution.cc">
       <provider selected="true" editor-type-id="text-editor" />
     </entry>
     <entry file="file://$PROJECT_DIR$/ping_pong_balls_factory.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="58">
           <caret line="9" column="6" lean-forward="true" selection-start-line="9" selection-start-column="6" selection-end-line="9" selection-end-column="26" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/main.cc">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="321">
           <caret line="58" column="25" selection-start-line="58" selection-start-column="25" selection-end-line="58" selection-end-column="25" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/csv_writer.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="180">
           <caret line="12" column="12" selection-start-line="12" selection-start-column="12" selection-end-line="12" selection-end-column="30" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/particles_factory_interface.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="118">
           <caret line="8" column="33" lean-forward="true" selection-start-line="8" selection-start-column="33" selection-end-line="8" selection-end-column="33" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/particles_factory_interface.cc">
       <provider selected="true" editor-type-id="text-editor">
         <state>
           <folding>
             <element signature="e#0#41#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/compute.hh">
       <provider selected="true" editor-type-id="text-editor" />
     </entry>
     <entry file="file://$PROJECT_DIR$/compute_temperature.cc">
       <provider selected="true" editor-type-id="text-editor" />
     </entry>
     <entry file="file://$PROJECT_DIR$/compute_gravity.hh">
       <provider selected="true" editor-type-id="text-editor" />
     </entry>
     <entry file="file://$PROJECT_DIR$/material_points_factory.cc">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="33">
           <caret line="29" lean-forward="true" selection-start-line="29" selection-end-line="29" selection-end-column="16" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/../../../readme.md">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="15">
           <caret line="1" lean-forward="true" selection-start-line="1" selection-end-line="1" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/main.py">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="118">
           <caret line="36" column="51" lean-forward="true" selection-start-line="36" selection-start-column="51" selection-end-line="36" selection-end-column="51" />
           <folding>
             <element signature="e#20#30#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/../README.md">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="120">
           <caret line="8" lean-forward="true" selection-start-line="5" selection-end-line="8" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/system_evolution.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="330">
           <caret line="23" column="37" lean-forward="true" selection-start-line="23" selection-start-column="37" selection-end-line="23" selection-end-column="37" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/material_points_factory.hh">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="365">
           <caret line="39" lean-forward="true" selection-start-line="39" selection-end-line="39" />
           <folding>
             <element signature="e#1200#1215#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/planets_factory.hh">
       <provider selected="true" editor-type-id="text-editor" />
     </entry>
-    <entry file="file://$PROJECT_DIR$/py_part.cpp">
+    <entry file="file://$PROJECT_DIR$/compute_temperature.hh">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="426">
-          <caret line="62" column="98" selection-start-line="62" selection-start-column="98" selection-end-line="62" selection-end-column="98" />
+        <state relative-caret-position="315">
+          <caret line="21" column="17" lean-forward="true" selection-start-line="21" selection-start-column="17" selection-end-line="21" selection-end-column="17" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/compute_temperature.hh">
+    <entry file="file://$PROJECT_DIR$/py_part.cpp">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="315">
-          <caret line="21" column="17" lean-forward="true" selection-start-line="21" selection-start-column="17" selection-end-line="21" selection-end-column="17" />
+        <state relative-caret-position="351">
+          <caret line="59" column="11" selection-start-line="59" selection-start-column="11" selection-end-line="59" selection-end-column="11" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/CMakeLists.txt">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="266">
+        <state relative-caret-position="538">
           <caret line="80" lean-forward="true" selection-start-line="80" selection-end-line="80" />
         </state>
       </provider>
     </entry>
   </component>
   <component name="masterDetails">
     <states>
       <state key="ScopeChooserConfigurable.UI">
         <settings>
           <splitter-proportions>
             <option name="proportions">
               <list>
                 <option value="0.2" />
               </list>
             </option>
           </splitter-proportions>
         </settings>
       </state>
     </states>
   </component>
 </project>
\ No newline at end of file
diff --git a/homework4/starting_point/CMakeLists.txt b/homework4/starting_point/CMakeLists.txt
index f9b61d4..e095efe 100644
--- a/homework4/starting_point/CMakeLists.txt
+++ b/homework4/starting_point/CMakeLists.txt
@@ -1,101 +1,102 @@
 cmake_minimum_required (VERSION 3.1)
 project (Particles)
 cmake_policy(VERSION 3.3)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PROJECT_SOURCE_DIR}/cmake")
 
 ################################################################
 # FFTW
 ################################################################
 
 find_package(FFTW)
 
 ################################################################
 # libpart
 ################################################################
 
 add_library(part SHARED
   compute_boundary.cc
   compute_verlet_integration.cc 
   particle.cc 
   planet.cc
   compute_gravity.cc 
   csv_reader.cc 
   particles_factory_interface.cc 
   planets_factory.cc 
   compute_contact.cc 
   compute_kinetic_energy.cc 
   csv_writer.cc 
   system.cc 
   compute_energy.cc 
   compute_potential_energy.cc 
   ping_pong_ball.cc
   material_point.cc 
   system_evolution.cc 
   ping_pong_balls_factory.cc 
   compute_interaction.cc
   compute_temperature.cc
   material_points_factory.cc 
   )
 
 target_link_libraries(part ${FFTW_LIBRARIES})
 add_executable(particles main.cc)
 target_link_libraries(particles part)
 
 
 ################################################################
 # Google test
 ################################################################
 
 
 include(GoogleTest)
 enable_testing()
 find_package(GTest)
 if (GTEST_FOUND)
     include_directories(${GTEST_INCLUDE_DIRS})
     add_executable(test_kepler test_kepler.cc)
     add_executable(test_fft test_fft.cc)
     target_link_libraries(test_kepler part ${GTEST_BOTH_LIBRARIES} pthread)
     target_link_libraries(test_fft part ${GTEST_BOTH_LIBRARIES} ${FFTW_LIBRARIES} pthread)
     gtest_discover_tests(test_kepler)
     gtest_discover_tests(test_fft)
 endif()
 
 ################################################################
 # Doxygen
 ################################################################
 
 find_package(Doxygen)
 if (DOXYGEN_FOUND)
 
     # to set other options, read: https://cmake.org/cmake/help/v3.9/module/FindDoxygen.html
     doxygen_add_docs(
             doxygen
             ${PROJECT_SOURCE_DIR}
             COMMENT "Generate html pages"
     )
     add_custom_target(doc DEPENDS doxygen)
 endif(DOXYGEN_FOUND)
 
+
 ################################################################
 # Pypart
 ################################################################
 
 option (WITH_PYTHON "Python wrapper" ON)
 
 if(WITH_PYTHON)
     find_package(pybind11 REQUIRED)
 
     add_library(pypart MODULE py_part.cpp)
     target_link_libraries(pypart PRIVATE part)
     target_link_libraries(pypart PRIVATE pybind11::module)
     set_target_properties(pypart PROPERTIES PREFIX "${PYTHON_MODULE_PREFIX}"
             SUFFIX "${PYTHON_MODULE_EXTENSION}")
 
     file(
             COPY ${CMAKE_CURRENT_SOURCE_DIR}/main.py
             DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/
     )
 endif(WITH_PYTHON)
\ No newline at end of file
diff --git a/homework4/starting_point/build-cmake-debug/CMakeFiles/pypart.dir/py_part.cpp.o b/homework4/starting_point/build-cmake-debug/CMakeFiles/pypart.dir/py_part.cpp.o
index 037c940..9072145 100644
Binary files a/homework4/starting_point/build-cmake-debug/CMakeFiles/pypart.dir/py_part.cpp.o and b/homework4/starting_point/build-cmake-debug/CMakeFiles/pypart.dir/py_part.cpp.o differ
diff --git a/homework4/starting_point/build-cmake-debug/pypart.cpython-36m-darwin.so b/homework4/starting_point/build-cmake-debug/pypart.cpython-36m-darwin.so
index 223a7eb..13997c4 100755
Binary files a/homework4/starting_point/build-cmake-debug/pypart.cpython-36m-darwin.so and b/homework4/starting_point/build-cmake-debug/pypart.cpython-36m-darwin.so differ
diff --git a/homework4/starting_point/py_part.cpp b/homework4/starting_point/py_part.cpp
index 90aa282..996f56f 100644
--- a/homework4/starting_point/py_part.cpp
+++ b/homework4/starting_point/py_part.cpp
@@ -1,66 +1,70 @@
 #include <functional>
 #include <iostream>
 #include <pybind11/pybind11.h>
 #include "planets_factory.hh"
 #include "ping_pong_balls_factory.hh"
 #include "material_points_factory.hh"
 #include "csv_writer.hh"
 #include "compute_temperature.hh"
 
 namespace py = pybind11;
 
 PYBIND11_MODULE(pypart, m) {
     m.doc() = "pybind particle plugin"; // optional docstring
 
     // wrap the class
     py::class_<ParticlesFactoryInterface>(m, "ParticlesFactoryInterface")
             .def("getInstance", &ParticlesFactoryInterface::getInstance,
                     py::return_value_policy::reference);
 
     py::class_<PingPongBallsFactory, ParticlesFactoryInterface>(m, "PingPongBallsFactory")
             .def("getInstance", &PingPongBallsFactory::getInstance,
                     py::return_value_policy::reference)
             .def("createSimulation", &PingPongBallsFactory::createSimulation,
                  py::return_value_policy::reference);
 
     py::class_<PlanetsFactory, ParticlesFactoryInterface>(m, "PlanetsFactory")
             .def("getInstance", &PlanetsFactory::getInstance,
                     py::return_value_policy::reference)
             .def("createSimulation", &PlanetsFactory::createSimulation,
                  py::return_value_policy::reference);
 
     py::class_<MaterialPointsFactory, ParticlesFactoryInterface>(m, "MaterialPointsFactory")
             .def("getInstance", &MaterialPointsFactory::getInstance,
                     py::return_value_policy::reference)
             .def("createSimulation",
                     (SystemEvolution & (MaterialPointsFactory::*)(const std::string &, Real))
                     &MaterialPointsFactory::createSimulation, py::return_value_policy::reference
             )
             .def("createSimulation", py::overload_cast<const std::string&, Real, py::function>
                     (&MaterialPointsFactory::createSimulation<py::function>),
                     py::return_value_policy::reference);
 
     py::class_<SystemEvolution>(m, "SystemEvolution")
             .def("setNSteps", &SystemEvolution::setNSteps)
             .def("setDumpFreq", &SystemEvolution::setDumpFreq)
             .def("evolve", &SystemEvolution::evolve)
             .def("getSystem", &SystemEvolution::getSystem,
                  py::return_value_policy::reference);
 
     py::class_<CsvWriter>(m, "CsvWriter")
             .def(py::init<const std::string&>())
             .def("write", &CsvWriter::write);
 
     py::class_<System>(m, "System");
 
     //Compute and ComputeTemperature wrappers are not implemented;
     //only name of the class ComputeTemperature for python script's header
+
+
+    py::class_<Compute>(m, "Compute");
+
     py::class_<ComputeTemperature, Compute>(m, "ComputeTemperature")
             .def_property("conductivity", &ComputeTemperature::getConductivity, &ComputeTemperature::setConductivity)
             .def_property("capacity", &ComputeTemperature::getCapacity, &ComputeTemperature::setCapacity)
             .def_property("desnsity", &ComputeTemperature::getDensity, &ComputeTemperature::setDensity)
             .def_property("L", &ComputeTemperature::getL, &ComputeTemperature::setL)
             .def_property("deltat", &ComputeTemperature::getDeltat, &ComputeTemperature::setDeltat);
 }