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<li class="toctree-l1"><a class="reference internal" href="Section_intro.html">1. Introduction</a></li>
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<div class="section" id="change-box-command">
<span id="index-0"></span><h1>change_box command</h1>
<div class="section" id="syntax">
<h2>Syntax</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">change_box</span> <span class="n">group</span><span class="o">-</span><span class="n">ID</span> <span class="n">parameter</span> <span class="n">args</span> <span class="o">...</span> <span class="n">keyword</span> <span class="n">args</span> <span class="o">...</span>
</pre></div>
</div>
<ul class="simple">
<li>group-ID = ID of group of atoms to (optionally) displace</li>
<li>one or more parameter/arg pairs may be appended</li>
</ul>
<pre class="literal-block">
parameter = <em>x</em> or <em>y</em> or <em>z</em> or <em>xy</em> or <em>xz</em> or <em>yz</em> or <em>boundary</em> or <em>ortho</em> or <em>triclinic</em> or <em>set</em> or <em>remap</em>
<em>x</em>, <em>y</em>, <em>z</em> args = style value(s)
style = <em>final</em> or <em>delta</em> or <em>scale</em> or <em>volume</em>
<em>final</em> values = lo hi
lo hi = box boundaries after displacement (distance units)
<em>delta</em> values = dlo dhi
dlo dhi = change in box boundaries after displacement (distance units)
<em>scale</em> values = factor
factor = multiplicative factor for change in box length after displacement
<em>volume</em> value = none = adjust this dim to preserve volume of system
<em>xy</em>, <em>xz</em>, <em>yz</em> args = style value
style = <em>final</em> or <em>delta</em>
<em>final</em> value = tilt
tilt = tilt factor after displacement (distance units)
<em>delta</em> value = dtilt
dtilt = change in tilt factor after displacement (distance units)
<em>boundary</em> args = x y z
x,y,z = <em>p</em> or <em>s</em> or <em>f</em> or <em>m</em>, one or two letters
<em>p</em> is periodic
<em>f</em> is non-periodic and fixed
<em>s</em> is non-periodic and shrink-wrapped
<em>m</em> is non-periodic and shrink-wrapped with a minimum value
<em>ortho</em> args = none = change box to orthogonal
<em>triclinic</em> args = none = change box to triclinic
<em>set</em> args = none = store state of current box
<em>remap</em> args = none = remap atom coords from last saved state to current box
</pre>
<ul class="simple">
<li>zero or more keyword/value pairs may be appended</li>
<li>keyword = <em>units</em></li>
</ul>
<pre class="literal-block">
<em>units</em> value = <em>lattice</em> or <em>box</em>
lattice = distances are defined in lattice units
box = distances are defined in simulation box units
</pre>
</div>
<div class="section" id="examples">
<h2>Examples</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">change_box</span> <span class="nb">all</span> <span class="n">xy</span> <span class="n">final</span> <span class="o">-</span><span class="mf">2.0</span> <span class="n">z</span> <span class="n">final</span> <span class="mf">0.0</span> <span class="mf">5.0</span> <span class="n">boundary</span> <span class="n">p</span> <span class="n">p</span> <span class="n">f</span> <span class="n">remap</span> <span class="n">units</span> <span class="n">box</span>
<span class="n">change_box</span> <span class="nb">all</span> <span class="n">x</span> <span class="n">scale</span> <span class="mf">1.1</span> <span class="n">y</span> <span class="n">volume</span> <span class="n">z</span> <span class="n">volume</span> <span class="n">remap</span>
</pre></div>
</div>
</div>
<div class="section" id="description">
<h2>Description</h2>
<p>Change the volume and/or shape and/or boundary conditions for the
simulation box. Orthogonal simulation boxes have 3 adjustable size
parameters (x,y,z). Triclinic (non-orthogonal) simulation boxes have
6 adjustable size/shape parameters (x,y,z,xy,xz,yz). Any or all of
them can be adjusted independently by this command. Thus it can be
used to expand or contract a box, or to apply a shear strain to a
non-orthogonal box. It can also be used to change the boundary
conditions for the simulation box, similar to the
<a class="reference internal" href="boundary.html"><span class="doc">boundary</span></a> command.</p>
<p>The size and shape of the initial simulation box are specified by the
<a class="reference internal" href="create_box.html"><span class="doc">create_box</span></a> or <a class="reference internal" href="read_data.html"><span class="doc">read_data</span></a> or
<a class="reference internal" href="read_restart.html"><span class="doc">read_restart</span></a> command used to setup the simulation.
The size and shape may be altered by subsequent runs, e.g. by use of
the <a class="reference internal" href="fix_nh.html"><span class="doc">fix npt</span></a> or <a class="reference internal" href="fix_deform.html"><span class="doc">fix deform</span></a> commands.
The <a class="reference internal" href="create_box.html"><span class="doc">create_box</span></a>, <a class="reference internal" href="read_data.html"><span class="doc">read data</span></a>, and
<a class="reference internal" href="read_restart.html"><span class="doc">read_restart</span></a> commands also determine whether the
simulation box is orthogonal or triclinic and their doc pages explain
the meaning of the xy,xz,yz tilt factors.</p>
<p>See <a class="reference internal" href="Section_howto.html#howto-12"><span class="std std-ref">Section_howto 12</span></a> of the doc pages
for a geometric description of triclinic boxes, as defined by LAMMPS,
and how to transform these parameters to and from other commonly used
triclinic representations.</p>
<p>The keywords used in this command are applied sequentially to the
simulation box and the atoms in it, in the order specified.</p>
<p>Before the sequence of keywords are invoked, the current box
size/shape is stored, in case a <em>remap</em> keyword is used to map the
atom coordinates from a previously stored box size/shape to the
current one.</p>
<p>After all the keywords have been processed, any shrink-wrap boundary
conditions are invoked (see the <a class="reference internal" href="boundary.html"><span class="doc">boundary</span></a> command)
which may change simulation box boundaries, and atoms are migrated to
new owning processors.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This means that you cannot use the change_box command to enlarge
a shrink-wrapped box, e.g. to make room to insert more atoms via the
<a class="reference internal" href="create_atoms.html"><span class="doc">create_atoms</span></a> command, because the simulation box
will be re-shrink-wrapped before the change_box command completes.
Instead you could do something like this, assuming the simulation box
is non-periodic and atoms extend from 0 to 20 in all dimensions:</p>
</div>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">change_box</span> <span class="nb">all</span> <span class="n">x</span> <span class="n">final</span> <span class="o">-</span><span class="mi">10</span> <span class="mi">20</span>
<span class="n">create_atoms</span> <span class="mi">1</span> <span class="n">single</span> <span class="o">-</span><span class="mi">5</span> <span class="mi">5</span> <span class="mi">5</span> <span class="c1"># this will fail to insert an atom</span>
</pre></div>
</div>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">change_box</span> <span class="nb">all</span> <span class="n">x</span> <span class="n">final</span> <span class="o">-</span><span class="mi">10</span> <span class="mi">20</span> <span class="n">boundary</span> <span class="n">f</span> <span class="n">s</span> <span class="n">s</span>
<span class="n">create_atoms</span> <span class="mi">1</span> <span class="n">single</span> <span class="o">-</span><span class="mi">5</span> <span class="mi">5</span> <span class="mi">5</span>
<span class="n">change_box</span> <span class="n">boundary</span> <span class="n">s</span> <span class="n">s</span> <span class="n">s</span> <span class="c1"># this will work</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Unlike the earlier &#8220;displace_box&#8221; version of this command, atom
remapping is NOT performed by default. This command allows remapping
to be done in a more general way, exactly when you specify it (zero or
more times) in the sequence of transformations. Thus if you do not
use the <em>remap</em> keyword, atom coordinates will not be changed even if
the box size/shape changes. If a uniformly strained state is desired,
the <em>remap</em> keyword should be specified.</p>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">It is possible to lose atoms with this command. E.g. by
changing the box without remapping the atoms, and having atoms end up
outside of non-periodic boundaries. It is also possible to alter
bonds between atoms straddling a boundary in bad ways. E.g. by
converting a boundary from periodic to non-periodic. It is also
possible when remapping atoms to put them (nearly) on top of each
other. E.g. by converting a boundary from non-periodic to periodic.
All of these will typically lead to bad dynamics and/or generate error
messages.</p>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The simulation box size/shape can be changed by arbitrarily
large amounts by this command. This is not a problem, except that the
mapping of processors to the simulation box is not changed from its
initial 3d configuration; see the <a class="reference internal" href="processors.html"><span class="doc">processors</span></a>
command. Thus, if the box size/shape changes dramatically, the
mapping of processors to the simulation box may not end up as optimal
as the initial mapping attempted to be.</p>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Because the keywords used in this command are applied one at a
time to the simulation box and the atoms in it, care must be taken
with triclinic cells to avoid exceeding the limits on skew after each
transformation in the sequence. If skew is exceeded before the final
transformation this can be avoided by changing the order of the
sequence, or breaking the transformation into two or more smaller
transformations. For more information on the allowed limits for box
skew see the discussion on triclinic boxes on <a class="reference internal" href="Section_howto.html#howto-12"><span class="std std-ref">this page</span></a>.</p>
</div>
<hr class="docutils" />
<p>For the <em>x</em>, <em>y</em>, and <em>z</em> parameters, this is the meaning of their
styles and values.</p>
<p>For style <em>final</em>, the final lo and hi box boundaries of a dimension
are specified. The values can be in lattice or box distance units.
See the discussion of the units keyword below.</p>
<p>For style <em>delta</em>, plus or minus changes in the lo/hi box boundaries
of a dimension are specified. The values can be in lattice or box
distance units. See the discussion of the units keyword below.</p>
<p>For style <em>scale</em>, a multiplicative factor to apply to the box length
of a dimension is specified. For example, if the initial box length
is 10, and the factor is 1.1, then the final box length will be 11. A
factor less than 1.0 means compression.</p>
<p>The <em>volume</em> style changes the specified dimension in such a way that
the overall box volume remains constant with respect to the operation
performed by the preceding keyword. The <em>volume</em> style can only be
used following a keyword that changed the volume, which is any of the
<em>x</em>, <em>y</em>, <em>z</em> keywords. If the preceding keyword &#8220;key&#8221; had a <em>volume</em>
style, then both it and the current keyword apply to the keyword
preceding &#8220;key&#8221;. I.e. this sequence of keywords is allowed:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">change_box</span> <span class="nb">all</span> <span class="n">x</span> <span class="n">scale</span> <span class="mf">1.1</span> <span class="n">y</span> <span class="n">volume</span> <span class="n">z</span> <span class="n">volume</span>
</pre></div>
</div>
<p>The <em>volume</em> style changes the associated dimension so that the
overall box volume is unchanged relative to its value before the
preceding keyword was invoked.</p>
<p>If the following command is used, then the z box length will shrink by
the same 1.1 factor the x box length was increased by:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">change_box</span> <span class="nb">all</span> <span class="n">x</span> <span class="n">scale</span> <span class="mf">1.1</span> <span class="n">z</span> <span class="n">volume</span>
</pre></div>
</div>
<p>If the following command is used, then the y,z box lengths will each
shrink by sqrt(1.1) to keep the volume constant. In this case, the
y,z box lengths shrink so as to keep their relative aspect ratio
constant:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">change_box</span> <span class="nb">all</span><span class="s2">&quot;x scale 1.1 y volume z volume</span>
</pre></div>
</div>
<p>If the following command is used, then the final box will be a factor
of 10% larger in x and y, and a factor of 21% smaller in z, so as to
keep the volume constant:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">change_box</span> <span class="nb">all</span> <span class="n">x</span> <span class="n">scale</span> <span class="mf">1.1</span> <span class="n">z</span> <span class="n">volume</span> <span class="n">y</span> <span class="n">scale</span> <span class="mf">1.1</span> <span class="n">z</span> <span class="n">volume</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">For solids or liquids, when one dimension of the box is
expanded, it may be physically undesirable to hold the other 2 box
lengths constant since that implies a density change. For solids,
adjusting the other dimensions via the <em>volume</em> style may make
physical sense (just as for a liquid), but may not be correct for
materials and potentials whose Poisson ratio is not 0.5.</p>
</div>
<p>For the <em>scale</em> and <em>volume</em> styles, the box length is expanded or
compressed around its mid point.</p>
<hr class="docutils" />
<p>For the <em>xy</em>, <em>xz</em>, and <em>yz</em> parameters, this is the meaning of their
styles and values. Note that changing the tilt factors of a triclinic
box does not change its volume.</p>
<p>For style <em>final</em>, the final tilt factor is specified. The value
can be in lattice or box distance units. See the discussion of the
units keyword below.</p>
<p>For style <em>delta</em>, a plus or minus change in the tilt factor is
specified. The value can be in lattice or box distance units. See
the discussion of the units keyword below.</p>
<p>All of these styles change the xy, xz, yz tilt factors. In LAMMPS,
tilt factors (xy,xz,yz) for triclinic boxes are required to be no more
than half the distance of the parallel box length. For example, if
xlo = 2 and xhi = 12, then the x box length is 10 and the xy tilt
factor must be between -5 and 5. Similarly, both xz and yz must be
between -(xhi-xlo)/2 and +(yhi-ylo)/2. Note that this is not a
limitation, since if the maximum tilt factor is 5 (as in this
example), then configurations with tilt = ..., -15, -5, 5, 15, 25,
... are all equivalent. Any tilt factor specified by this command
must be within these limits.</p>
<hr class="docutils" />
<p>The <em>boundary</em> keyword takes arguments that have exactly the same
meaning as they do for the <a class="reference internal" href="boundary.html"><span class="doc">boundary</span></a> command. In each
dimension, a single letter assigns the same style to both the lower
and upper face of the box. Two letters assigns the first style to the
lower face and the second style to the upper face.</p>
<p>The style <em>p</em> means the box is periodic; the other styles mean
non-periodic. For style <em>f</em>, the position of the face is fixed. For
style <em>s</em>, the position of the face is set so as to encompass the
atoms in that dimension (shrink-wrapping), no matter how far they
move. For style <em>m</em>, shrink-wrapping occurs, but is bounded by the
current box edge in that dimension, so that the box will become no
smaller. See the <a class="reference internal" href="boundary.html"><span class="doc">boundary</span></a> command for more
explanation of these style options.</p>
<p>Note that the &#8220;boundary&#8221; command itself can only be used before the
simulation box is defined via a <a class="reference internal" href="read_data.html"><span class="doc">read_data</span></a> or
<a class="reference internal" href="create_box.html"><span class="doc">create_box</span></a> or <a class="reference internal" href="read_restart.html"><span class="doc">read_restart</span></a>
command. This command allows the boundary conditions to be changed
later in your input script. Also note that the
<a class="reference internal" href="read_restart.html"><span class="doc">read_restart</span></a> will change boundary conditions to
match what is stored in the restart file. So if you wish to change
them, you should use the change_box command after the read_restart
command.</p>
<hr class="docutils" />
<p>The <em>ortho</em> and <em>triclinic</em> keywords convert the simulation box to be
orthogonal or triclinic (non-orthongonal). See <a class="reference internal" href="Section_howto.html#howto-13"><span class="std std-ref">this section</span></a> for a discussion of how non-orthongal
boxes are represented in LAMMPS.</p>
<p>The simulation box is defined as either orthogonal or triclinic when
it is created via the <a class="reference internal" href="create_box.html"><span class="doc">create_box</span></a>,
<a class="reference internal" href="read_data.html"><span class="doc">read_data</span></a>, or <a class="reference internal" href="read_restart.html"><span class="doc">read_restart</span></a>
commands.</p>
<p>These keywords allow you to toggle the existing simulation box from
orthogonal to triclinic and vice versa. For example, an initial
equilibration simulation can be run in an orthogonal box, the box can
be toggled to triclinic, and then a <a class="reference internal" href="Section_howto.html#howto-13"><span class="std std-ref">non-equilibrium MD (NEMD) simulation</span></a> can be run with deformation
via the <a class="reference internal" href="fix_deform.html"><span class="doc">fix deform</span></a> command.</p>
<p>If the simulation box is currently triclinic and has non-zero tilt in
xy, yz, or xz, then it cannot be converted to an orthogonal box.</p>
<hr class="docutils" />
<p>The <em>set</em> keyword saves the current box size/shape. This can be
useful if you wish to use the <em>remap</em> keyword more than once or if you
wish it to be applied to an intermediate box size/shape in a sequence
of keyword operations. Note that the box size/shape is saved before
any of the keywords are processed, i.e. the box size/shape at the time
the create_box command is encountered in the input script.</p>
<p>The <em>remap</em> keyword remaps atom coordinates from the last saved box
size/shape to the current box state. For example, if you stretch the
box in the x dimension or tilt it in the xy plane via the <em>x</em> and <em>xy</em>
keywords, then the <em>remap</em> commmand will dilate or tilt the atoms to
conform to the new box size/shape, as if the atoms moved with the box
as it deformed.</p>
<p>Note that this operation is performed without regard to periodic
boundaries. Also, any shrink-wrapping of non-periodic boundaries (see
the <a class="reference internal" href="boundary.html"><span class="doc">boundary</span></a> command) occurs after all keywords,
including this one, have been processed.</p>
<p>Only atoms in the specified group are remapped.</p>
<hr class="docutils" />
<p>The <em>units</em> keyword determines the meaning of the distance units used
to define various arguments. A <em>box</em> value selects standard distance
units as defined by the <a class="reference internal" href="units.html"><span class="doc">units</span></a> command, e.g. Angstroms for
units = real or metal. A <em>lattice</em> value means the distance units are
in lattice spacings. The <a class="reference internal" href="lattice.html"><span class="doc">lattice</span></a> command must have
been previously used to define the lattice spacing.</p>
</div>
<hr class="docutils" />
<div class="section" id="restrictions">
<h2>Restrictions</h2>
<p>If you use the <em>ortho</em> or <em>triclinic</em> keywords, then at the point in
the input script when this command is issued, no <a class="reference internal" href="dump.html"><span class="doc">dumps</span></a> can
be active, nor can a <a class="reference internal" href="fix_deform.html"><span class="doc">fix deform</span></a> be active. This is
because these commands test whether the simulation box is orthogonal
when they are first issued. Note that these commands can be used in
your script before a change_box command is issued, so long as an
<a class="reference internal" href="undump.html"><span class="doc">undump</span></a> or <a class="reference internal" href="unfix.html"><span class="doc">unfix</span></a> command is also used to
turn them off.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands</h2>
<p><a class="reference internal" href="fix_deform.html"><span class="doc">fix deform</span></a>, <a class="reference internal" href="boundary.html"><span class="doc">boundary</span></a></p>
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<h2>Default</h2>
<p>The option default is units = lattice.</p>
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