			% Class to store data versus time.
			% Data can be continuously appended and saved. It is possible to add
			% labels (time marks) for particular moments in time. Data can be saved
			% and plotted with the time marks.
			% Metadata for this class is stored independently.
			% If instantiated as MyLog(load_path) then
			% the content is loaded from file

			classdef MyLog < matlab.mixin.Copyable

			properties (Access=public)
			% Save time as posixtime up to ms precision
			time_fmt = '%14.3f'

			% Save data as reals with up to 14 decimal digits. Trailing zeros
			% are removed by %g
			data_fmt = '%.14g'

			% Format for displaying the last reading (column name: value)
			disp_fmt = '%15s: %.2g'

			% Data column and line separators
			column_sep = '\t'
			line_sep='\r\n'

			% File extension that is appended by default when saving the log
			% if a different one is not specified explicitly
			data_file_ext = '.log'

			% File extension for metadata
			meta_file_ext = '.meta'

			file_name = '' % Used to save or load the data
			data_headers = {} % Cell array of column headers

			length_lim = Inf % Keep the log length below this limit

			% Format for string representation of timestamps
			datetime_fmt = 'yyyy-MMM-dd HH:mm:ss'
			end

			properties (SetAccess=public, GetAccess=public)
			timestamps % Times at which data was aqcuired
			data % Array of measurements
			TimeLabels % Structure array that stores labeled time marks

			% Structure array that stores all the axes the log is plotted in
			PlotList;

			% Information about the log in saveable format,
			% including time labels and data headers
			Metadata
			end

			properties (Dependent=true)
			data_line_fmt % Format specifier for one data row to be printed

			column_headers % Time column header + data column headers

			data_file_name % File name with extension for data saving
			meta_file_name % File name with extension for metadata saving

			timestamps_num % timestamps converted to numeric format
			end

			methods (Access=public)

			%% Constructor and destructor methods
			function this = MyLog(varargin)
			P=MyClassParser(this);
			% options for MeasHeaders
			addParameter(P, 'metadata_opts',{},@iscell);

			if mod(length(varargin),2)==1
			% odd number of elements in varargin - interpret the first
			% element as file name and the rest as name-value pairs
			load_path=varargin{1};
			assert(ischar(load_path)&&isvector(load_path),...
			'''file_name'' must be a vector of characters');
			processInputs(P, this, varargin{2:end});
			this.file_name=load_path;
			else
			% Parse varargin as a list of name-value pairs
			processInputs(P, this, varargin{:});
			load_path=[];
			end

			this.Metadata=MyMetadata(P.Results.metadata_opts{:});

			% Create an empty structure array of time labels
			this.TimeLabels=struct(...
			'time',{},... % datetime object
			'time_str',{},... % time in text format
			'text_str',{}); % message string

			% Create an empty structure array of axes
			this.PlotList=struct(...
			'Axes',{},... % axes handles
			'DataLines',{},... % data line handles
			'LbLines',{},... % labels line handles
			'LbText',{}); % labels text handles

			% Load the data from file if the file name was provided
			if ~isempty(load_path)
			load(this, load_path);
			end

			end

			%% Save and load functionality
			% save the entire data record
			function save(this, fname)
			% Verify that the data can be saved
			assertDataMatrix(this);

			% File name can be either supplied explicitly or given as the
			% file_name property
			if nargin()<2
			fname = this.file_name;
			else
			this.file_name=fname;
			end

			assert(~isempty(fname), 'File name is not provided.');

			datfname=this.data_file_name;
			metfname=this.meta_file_name;

			stat=createFile(datfname);
			if stat
			% Save time labels in separate file
			save(this.Metadata, metfname, 'overwrite', true);

			fid = fopen(datfname,'w');
			% Write column headers
			str=printDataHeaders(this);
			fprintf(fid,'%s',str);
			% Write data body
			fmt=this.data_line_fmt;
			for i=1:length(this.timestamps)
			fprintf(fid, fmt, this.timestamps_num(i), ...
			this.data(i,:));
			end
			fclose(fid);
			end
			end


			% Load log from file
			function load(this, fname)
			if nargin()==2
			this.file_name=fname;
			end

			assert(~isempty(this.file_name), 'File name is not provided.');
			assert(exist(this.data_file_name, 'file')==2, ...
			['File ''',this.data_file_name,''' is not found.'])

			% Load metadata if file is found
			% Fields of Metadata are re-initialized by its get method, so
			% need to copy in order for the loaded information to be not
			% overwritten, on one hand, and on the other hand to use the
			% formatting defined by Metadata.
			M=copy(this.Metadata);
			clearFields(M);
			if exist(this.meta_file_name, 'file')==2
			load(M, this.meta_file_name);
			end

			% Read column headers from data file
			fid=fopen(fname,'r');
			dat_col_heads=strsplit(fgetl(fid),this.column_sep, ...
			'CollapseDelimiters', true);
			fclose(fid);

			% Read data as delimiter-separated values and convert to cell
			% array, skip the first line containing column headers
			fulldata = dlmread(fname, this.column_sep, 1, 0);

			this.data = fulldata(:,2:end);
			this.timestamps = fulldata(:,1);

			% Process metadata
			% Assign column headers first, prioritizing those found in
			% the metadata file over those found in the main file. This is
			% done because the column names in the main file are not
			% updated once they are printed, while the column names in
			% metadata are always up to date.
			if ismember('ColumnNames', M.field_names) && ...
			length(M.ColumnNames.Name.value)>=2
			% Assign column headers from metadata if present
			this.data_headers=M.ColumnNames.Name.value(2:end);
			elseif length(dat_col_heads)>=2
			this.data_headers=dat_col_heads(2:end);
			end

			% Assign time labels
			if ismember('TimeLabels', M.field_names)
			Lbl=M.TimeLabels.Lbl.value;
			for i=1:length(Lbl)
			this.TimeLabels(i).time_str=Lbl(i).time_str;
			this.TimeLabels(i).time=datetime(Lbl(i).time_str, ...
			'Format', this.datetime_fmt);
			this.TimeLabels(i).text_str=Lbl(i).text_str;
			end
			end

			% Convert the time stamps to datetime if the time column
			% format is posixtime
			if ~isempty(dat_col_heads) && ...
			contains(dat_col_heads{1},'posix','IgnoreCase',true)
			this.timestamps=datetime(this.timestamps, ...
			'ConvertFrom','posixtime','Format',this.datetime_fmt);
			end
			end

			%% Plotting

			% Plot the log data with time labels. Reurns plotted line objects.
			function Pls = plot(this, varargin)
			% Verify that the data is a numeric matrix,
			% otherwise it cannot be plotted
			assertDataMatrix(this);

			[~, ncols] = size(this.data);

			p=inputParser();
			% Axes in which log should be plotted
			addOptional(p, 'Ax', [], @(x)assert( ...
			isa(x,'matlab.graphics.axis.Axes')\|\|...
			isa(x,'matlab.ui.control.UIAxes'),...
			'Argument must be axes or uiaxes.'));

			% If time labels are to be displayed
			addParameter(p, 'time_labels', true, @islogical);

			% If legend is to be displayed
			addParameter(p, 'legend', true, @islogical);

			% Logical vector defining the data columns to be displayed
			addParameter(p, 'isdisp', true(1,ncols), @(x) assert(...
			islogical(x) && isvector(x) && length(x)==ncols, ...
			['''isdisp'' must be a logical vector of the size ',...
			'equal to the number of data columns.']));

			% If 'reset' is true than all the data lines and time labels are
			% re-plotted with default style even if they are already present
			% in the plot
			addParameter(p, 'reset', false, @islogical);

			parse(p, varargin{:});

			if ~isempty(p.Results.Ax)
			Ax=p.Results.Ax;
			else
			Ax=gca();
			end

			% Find out if the log was already plotted in these axes. If
			% not, appned Ax to the PlotList.
			ind=findPlotInd(this, Ax);
			if isempty(ind)
			l=length(this.PlotList);
			this.PlotList(l+1).Axes=Ax;
			ind=l+1;
			end

			% Plot data
			if isempty(this.PlotList(ind).DataLines)
			% If the log was never plotted in Ax,
			% plot using default style and store the line handles
			Pls=line(Ax, this.timestamps, this.data);
			this.PlotList(ind).DataLines=Pls;
			else
			% Replace existing data
			Pls=this.PlotList(ind).DataLines;
			for i=1:length(Pls)
			try
			Pls(i).XData=this.timestamps;
			Pls(i).YData=this.data(:,i);
			catch
			warning(['Could not update plot for '...
			'%i-th data column'],i);
			end
			end
			end

			% Set the visibility of lines
			if ~ismember('isdisp',p.UsingDefaults)
			for i=1:ncols
			Pls(i).Visible=p.Results.isdisp(i);
			end
			end

			% Plot time labels and legend
			if (p.Results.time_labels)
			plotTimeLabels(this, Ax);
			end
			if (p.Results.legend)&&(~isempty(this.data_headers))&&...
			(~isempty(this.data))
			% Add legend only for for those lines that are displayed
			disp_ind = cellfun(@(x)strcmpi(x,'on'),{Pls.Visible});
			legend(Ax, Pls(disp_ind), this.data_headers{disp_ind},...
			'Location','southwest');
			end

			end

			%% Manipulations with log data

			% Append data point to the log
			function appendData(this, time, val, varargin)
			p=inputParser();
			addParameter(p, 'save', false, @islogical);
			parse(p, varargin{:});

			% Format checks on the input data
			assert(isa(time,'datetime')\|\|isnumeric(time),...
			['''time'' argument must be numeric or ',...
			'of the class datetime.']);
			assert(isrow(val),'''val'' argument must be a row vector.');

			if ~isempty(this.data)
			[~, ncols]=size(this.data);
			assert(length(val)==ncols,['Length of ''val'' ',...
			'does not match the number of data columns']);
			end

			% Ensure time format
			if isa(time,'datetime')
			time.Format=this.datetime_fmt;
			end

			% Append new data and time stamps
			this.timestamps=[this.timestamps; time];
			this.data=[this.data; val];

			% Ensure the log length is within the length limit
			trim(this);

			% Optionally save the new data point to file
			if p.Results.save
			try
			exstat = exist(this.data_file_name,'file');
			if exstat==0
			% if the file does not exist, create it and write
			% the column headers
			createFile(this.data_file_name);
			fid = fopen(this.data_file_name,'w');
			str=printDataHeaders(this);
			fprintf(fid,'%s',str);
			else
			% otherwise open for appending
			fid = fopen(this.data_file_name,'a');
			end
			% Convert the new timestamps to numeric form for saving
			if isa(time,'datetime')
			time_num=posixtime(time);
			else
			time_num=time;
			end
			% Append new data points to file
			fprintf(fid, this.data_line_fmt, time_num, val);
			fclose(fid);

			% Save metadata with time labels
			if ~isempty(this.TimeLabels) && ...
			exist(this.meta_file_name, 'file')==0
			save(this.Metadata, this.meta_file_name, ...
			'overwrite', true);
			end
			catch
			warning(['Logger cannot save data at time = ',...
			datestr(datetime('now', ...
			'Format',this.datetime_fmt))]);
			% Try closing fid in case it is still open
			try
			fclose(fid);
			catch
			end
			end
			end
			end

			%% Time labels

			function plotTimeLabels(this, Ax)
			% Find out if the log was already plotted in these axes
			ind=findPlotInd(this, Ax);
			if isempty(ind)
			l=length(this.PlotList);
			this.PlotList(l+1).Axes=Ax;
			ind=l+1;
			end

			% Remove existing labels
			eraseTimeLabels(this, Ax);

			% Define marker lines to span over the entire plot
			ymin=Ax.YLim(1);
			ymax=Ax.YLim(2);
			markline = linspace(ymin, ymax, 2);

			% Plot labels
			for i=1:length(this.TimeLabels)
			T=this.TimeLabels(i);
			marktime = [T.time,T.time];
			% Add text label to plot, with 5% offset from
			% the boundary for beauty
			Txt=text(Ax, T.time, ymin+0.95*(ymax-ymin), T.text_str,...
			'Units','data',...
			'HorizontalAlignment','right',...
			'VerticalAlignment','top',...
			'FontWeight', 'bold',...
			'Rotation',90,...
			'BackgroundColor','white',...
			'Clipping','on',...
			'Margin',1);
			% Add line to plot
			Pl=line(Ax, marktime, markline,'color','black');
			% Store the handles of text and line
			this.PlotList(ind).LbLines = ...
			[this.PlotList(ind).LbLines,Pl];
			this.PlotList(ind).LbText = ...
			[this.PlotList(ind).LbText,Txt];
			end
			end

			% Remove existing labels from the plot
			function eraseTimeLabels(this, Ax)
			% Find out if the log was already plotted in these axes
			ind=findPlotInd(this, Ax);
			if ~isempty(ind)
			% Remove existing labels
			delete(this.PlotList(ind).LbLines);
			this.PlotList(ind).LbLines=[];
			delete(this.PlotList(ind).LbText);
			this.PlotList(ind).LbText=[];
			else
			warning('Cannot erase time labels. Axes not found.')
			end
			end

			% Add label
			% Form with optional arguments: addTimeLabel(this, time, str)
			function addTimeLabel(this, varargin)
			p=inputParser();
			addOptional(p, 'time', ...
			datetime('now', 'Format', this.datetime_fmt), ...
			@(x)assert(isa(x,'datetime'), ...
			'''time'' must be of the type datetime.'));
			addOptional(p, 'str', '', ...
			@(x) assert(iscellstr(x)\|\|ischar(x)\|\|isstring(x), ...
			'''str'' must be a string or cell array of strings.'));
			addParameter(p, 'save', false, @islogical);
			parse(p, varargin{:});

			if any(ismember({'time','str'}, p.UsingDefaults))
			% Invoke a dialog to add the label time and name
			answ = inputdlg({'Label text', 'Time'},'Add time label',...
			[2 40; 1 40],{'',datestr(p.Results.time)});

			if isempty(answ)\|\|isempty(answ{1})
			return
			else
			% Conversion of the inputed value to datetime to
			% ensure proper format
			time=datetime(answ{2}, 'Format', this.datetime_fmt);
			% Store multiple lines as cell array
			str=cellstr(answ{1});
			end
			end

			% Need to calculate length explicitly as using 'end' fails
			% for an empty array
			l=length(this.TimeLabels);

			this.TimeLabels(l+1).time=time;
			this.TimeLabels(l+1).time_str=datestr(time);
			this.TimeLabels(l+1).text_str=str;

			% Order time labels by ascending time
			sortTimeLabels(this);

			if p.Results.save==true
			% Save metadata with new time labels
			save(this.Metadata, this.meta_file_name, ...
			'overwrite', true);
			end
			end

			% Modify text or time of an exising label. If new time and text are
			% not provided as arguments, modifyTimeLabel(this, ind, time, str),
			% invoke a dialog.
			% ind - index of the label to be modified in TimeLabels array.
			function modifyTimeLabel(this, ind, varargin)
			p=inputParser();
			addRequired(p, 'ind', @(x)assert((rem(x,1)==0)&&(x>0), ...
			'''ind'' must be a positive integer.'));
			addOptional(p, 'time', ...
			datetime('now', 'Format', this.datetime_fmt), ...
			@(x)assert(isa(x,'datetime'), ...
			'''time'' must be of the type datetime.'));
			addOptional(p, 'str', '', ...
			@(x) assert(iscellstr(x)\|\|ischar(x)\|\|isstring(x), ...
			'''str'' must be a string or cell array of strings.'));
			addParameter(p, 'save', false, @islogical);
			parse(p, ind, varargin{:});

			if any(ismember({'time','str'}, p.UsingDefaults))
			Tlb=this.TimeLabels(ind);
			answ = inputdlg({'Label text', 'Time'},'Modify time label',...
			[2 40; 1 40],{char(Tlb.text_str), Tlb.time_str});

			if isempty(answ)\|\|isempty(answ{1})
			return
			else
			% Convert the input value to datetime and ensure
			% proper format
			time=datetime(answ{2}, 'Format', this.datetime_fmt);
			% Store multiple lines as cell array
			str=cellstr(answ{1});
			end
			end

			this.TimeLabels(ind).time=time;
			this.TimeLabels(ind).time_str=datestr(time);
			this.TimeLabels(ind).text_str=str;

			% Order time labels by ascending time
			sortTimeLabels(this);

			if p.Results.save==true
			% Save metadata with new time labels
			save(this.Metadata, this.meta_file_name, ...
			'overwrite', true);
			end
			end

			% Show the list of labels in readable format
			function lst=printTimeLabelList(this)
			lst=cell(length(this.TimeLabels),1);
			for i=1:length(this.TimeLabels)
			if ischar(this.TimeLabels(i).text_str) \|\|...
			isstring(this.TimeLabels(i).text_str)
			tmpstr=this.TimeLabels(i).text_str;
			elseif iscell(this.TimeLabels(i).text_str)
			% If text is cell array, elements corresponding to
			% multiple lines, display the first line
			tmpstr=this.TimeLabels(i).text_str{1};
			end
			lst{i}=[this.TimeLabels(i).time_str,' ', tmpstr];
			end
			end

			%% Misc public functions

			% Clear log data and time labels
			function clear(this)
			% Clear while preserving the array types
			this.TimeLabels(:)=[];

			% Delete all the data lines and time labels
			for i=1:length(this.PlotList)
			delete(this.PlotList(i).DataLines);
			delete(this.PlotList(i).LbLines);
			delete(this.PlotList(i).LbText);
			end
			this.PlotList(:)=[];

			% Clear data and its type
			this.timestamps = [];
			this.data = [];
			end

			% Verify that the data can be saved or plotted
			function assertDataMatrix(this)
			assert(ismatrix(this.data)&&isnumeric(this.data),...
			['Data is not a numeric matrix, saving in '...
			'text format is not possible.']);
			end

			% Display last reading
			function str = printLastReading(this)
			if isempty(this.timestamps)
			str = '';
			else
			str = ['Last reading ',char(this.timestamps(end)),newline];
			last_data = this.data(end,:);
			for i=1:length(last_data)
			if length(this.data_headers)>=i
			lbl = this.data_headers{i};
			else
			lbl = sprintf('data%i',i);
			end
			str = [str,...
			sprintf(this.disp_fmt,lbl,last_data(i)),newline]; %#ok<AGROW>
			end
			end
			end
			end

			methods (Access=private)
			%% Auxiliary private functions

			% Ensure the log length is within length limit
			function trim(this)
			l=length(this.timestamps);
			if l>this.length_lim
			dn=l-this.length_lim;
			this.timestamps(1:dn)=[];
			this.data(1:dn)=[];
			end
			end

			% Print column names to a string
			function str=printDataHeaders(this)
			cs=this.column_sep;
			str=sprintf(['%s',cs], this.column_headers{:});
			str=[str,sprintf(this.line_sep)];
			end

			% Find out if the log was already plotted in the axes Ax and return
			% the corresponding index of PlotList if it was
			function ind=findPlotInd(this, Ax)
			assert(isvalid(Ax),'Ax must be valid axes or uiaxes')

			if ~isempty(this.PlotList)
			ind_b=cellfun(@(x) isequal(x, Ax),{this.PlotList.Axes});
			% Find index of the first match
			ind=find(ind_b,1);
			else
			ind=[];
			end
			end

			% Re-order the elements of TimeLabels array so that labels
			% corresponding to later times have larger index
			function sortTimeLabels(this)
			times=[this.TimeLabels.time];
			[~,ind]=sort(times);
			this.TimeLabels=this.TimeLabels(ind);
			end
			end

			%% set and get methods
			methods

			function set.length_lim(this, val)
			assert(isreal(val),'''length_lim'' must be a real number');
			% Make length_lim non-negative and integer
			this.length_lim=max(0, round(val));
			% Apply the new length limit to log
			trim(this);
			end

			function set.data_headers(this, val)
			assert(iscellstr(val) && isrow(val), ['''data_headers'' must '...
			'be a row cell array of character strings.']) %#ok<ISCLSTR>
			this.data_headers=val;
			end

			% The get function for file_name adds extension if it is not
			% already present and also ensures proper file separators
			% (by splitting and combining the file name)
			function fname = get.data_file_name(this)
			fname = this.file_name;
			[filepath,name,ext] = fileparts(fname);
			if isempty(ext)
			ext=this.data_file_ext;
			end
			fname = fullfile(filepath,[name,ext]);
			end

			function fname = get.meta_file_name(this)
			fname = this.file_name;
			[filepath,name,~] = fileparts(fname);
			ext=this.meta_file_ext;
			fname = fullfile(filepath,[name,ext]);
			end

			function data_line_fmt=get.data_line_fmt(this)
			cs=this.column_sep;
			nl=this.line_sep;

			if isempty(this.data)
			l=0;
			else
			[~,l]=size(this.data);
			end

			data_line_fmt = this.time_fmt;
			for i=1:l
			data_line_fmt = [data_line_fmt, cs, this.data_fmt]; %#ok<AGROW>
			end
			data_line_fmt = [data_line_fmt, nl];
			end

			function hdrs=get.column_headers(this)
			% Add header for the time column
			if isa(this.timestamps,'datetime')
			time_title_str = 'POSIX time (s)';
			else
			time_title_str = 'Time';
			end
			hdrs=[time_title_str,this.data_headers];
			end

			function time_num_arr=get.timestamps_num(this)
			% Convert time stamps to numbers
			if isa(this.timestamps,'datetime')
			time_num_arr=posixtime(this.timestamps);
			else
			time_num_arr=this.timestamps;
			end
			end

			function Mdt=get.Metadata(this)
			Mdt=this.Metadata;
			% Clear Metadata but preserve formatting
			clearFields(Mdt);

			% Add column names
			addField(Mdt, 'ColumnNames');
			addParam(Mdt, 'ColumnNames', 'Name', this.column_headers)

			if ~isempty(this.TimeLabels)
			% Add time labels (textual part of TimeLabels structure)
			addField(Mdt, 'TimeLabels');
			Lbl=struct('time_str', {this.TimeLabels.time_str},...
			'text_str', {this.TimeLabels.text_str});
			addParam(Mdt, 'TimeLabels', 'Lbl', Lbl)
			end
			end
			end
			end

rINSTCONTROL/@MyLog/MyLog.m
3782809f3abaconfint-fix

MyLog.m
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rINSTCONTROL/@MyLog/MyLog.m3782809f3abaconfint-fix

MyLog.mView Options

rINSTCONTROL/@MyLog/MyLog.m
3782809f3abaconfint-fix

MyLog.m
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