			% 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, SetObservable = true)

			% 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'

			% 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'

			% Formatting options for the metadata
			metadata_opts = {}

			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'

			save_cont = false % If true changes are continuously saved
			end

			properties (GetAccess = public, SetAccess = protected, ...
			SetObservable = true)

			timestamps % Times at which data was aqcuired
			data % Array of measurements

			% Structure array that stores labeled time marks
			TimeLabels = struct( ...
			'time', {}, ... % datetime object
			'time_str', {}, ... % time in text format
			'text_str', {}); % message string

			% Structure array that stores all the axes the log is plotted in
			PlotList = struct( ...
			'Axes', {}, ... % axes handles
			'DataLines',{}, ... % data line handles
			'LbLines', {}, ... % label line handles
			'BgLines', {}); % label line background handles

			% First timestamp that was saved in the current file. This value
			% is used to decide which time labels to retain under when the log
			% data is being trimmed.
			FirstSaveTime = datetime.empty()
			end

			properties (Dependent = true)
			channel_no % Number of data colums

			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)
			function this = MyLog(varargin)
			P = MyClassParser(this);
			processInputs(P, this, varargin{:});
			end

			% save the entire data record
			function save(this, filename)

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

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

			datfname = this.data_file_name;

			stat = createFile(datfname);
			if ~stat
			return
			end

			fid = fopen(datfname, 'w');

			% Write column headers
			str = printDataHeaders(this);
			fprintf(fid, '%s', str);

			% Write the bulk of data
			fmt = this.data_line_fmt;
			for i = 1:length(this.timestamps)
			fprintf(fid, fmt, this.timestamps_num(i), this.data(i,:));
			end
			fclose(fid);

			this.FirstSaveTime = this.timestamps(1);

			% Save time labels in a separate file
			saveMetadata(this);
			end

			%% Plotting

			% Plot the log data with time labels. Reurns plotted line objects.
			function Pls = plot(this, varargin)
			[~, ncols] = size(this.data);

			p = inputParser();

			% Axes in which log should be plotted
			addOptional(p, 'Axes', [], @(x)assert(isaxes(x),...
			'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.']));

			parse(p, varargin{:});

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

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

			% Replace existing data
			Pls = this.PlotList(ind).DataLines;
			for i = 1:length(Pls)

			% Set new data and timestamps at the same time to
			% prevent a conflict of array sizes
			set(Pls(i), ...
			'XData', this.timestamps, ...
			'YData', this.data(:,i));
			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

			if p.Results.time_labels

			% Plot time labels
			plotTimeLabels(this, ind);
			else

			% Hide existing time labels
			try
			set(this.PlotList(ind).LbLines, 'Visible', 'off');
			set(this.PlotList(ind).BgLines, 'Visible', 'off');
			catch ME
			warning(ME.message)
			end
			end

			% Add legend
			if isempty(Axes.Legend)
			legend(Axes, 'Location', 'southwest');
			end

			if p.Results.legend && ~isempty(this.data_headers) && ...
			~isempty(this.data)

			% Display the legend
			Axes.Legend.Visible = 'on';
			Axes.Legend.String = this.data_headers;

			% Include only those lines that are visible
			for i = 1:ncols
			Pls(i).Annotation.LegendInformation.IconDisplayStyle = ...
			Pls(i).Visible;
			end
			else

			% Hide the legend
			Axes.Legend.Visible = 'off';
			end
			end

			% Append data point to the log
			function appendData(this, Time, val)

			% 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) && isnumeric(val), ...
			'''val'' argument must be a numeric 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 this.save_cont
			try
			if exist(this.data_file_name, 'file') == 2

			% Otherwise open for appending
			fid = fopen(this.data_file_name, 'a');
			else

			% 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);
			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);

			if isempty(this.FirstSaveTime)
			this.FirstSaveTime = Time;
			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

			% Add label
			function addTimeLabel(this, varargin)
			p = inputParser();

			addParameter(p, 'Time', datetime('now'), ...
			@(x)assert(isa(x, 'datetime'), ['''Time'' must be of ' ...
			'the type datetime.']))

			addParameter(p, 'text', '', ...
			@(x)assert(iscellstr(x) \|\| ischar(x) \|\| isstring(x), ...
			'''text'' must be a string or cell array of strings.'))

			% If 'index' is specified, then the function configures an
			% existing time label instead of adding a new one
			addParameter(p, 'index', [], ...
			@(x)assert(floor(x)==x && x<=length(this.TimeLabels), ...
			['Index must be a positive integer not exceeding the ' ...
			'number of time labels.']))

			parse(p, varargin{:})

			Time = p.Results.Time;
			Time.Format = this.datetime_fmt;

			if ismember('text', p.UsingDefaults)

			% Invoke a dialog to input label time and name
			if ismember('index', p.UsingDefaults)

			% Default dialog field values
			dlg_args = {'', datestr(Time)};
			else

			% Provide existing values for modification
			Tlb = this.TimeLabels(p.Results.index);
			dlg_args = {char(Tlb.text_str), Tlb.time_str};
			end

			answ = inputdlg({'Label text', 'Time'},'Add time label',...
			[2 40; 1 40], dlg_args);

			% If 'Cancel' button is pressed or no input is provided, do
			% not modify or add a new label
			if isempty(answ) \|\| isempty(answ{1})
			return
			end

			% Convert the inputed value to datetime with proper format
			Time = datetime(answ{2}, 'Format', this.datetime_fmt);

			% Store multiple lines as cell array
			str = cellstr(answ{1});
			else
			str = cellstr(p.Results.text);
			end

			if ~isempty(this.timestamps) && (Time < this.timestamps(1))
			warning(['The time of label ''%s'' is earlier than ' ...
			'the first timestamp in memory. Such time label ' ...
			'will not be plotted but will be saved in ' ...
			'metadata.'], str{1});
			end

			if ~isempty(this.FirstSaveTime) && (Time < this.FirstSaveTime)
			warning(['The time of label ''%s'' is earlier than ' ...
			'the first timestamp in the current data file. ' ...
			'Such time label will not be automatically saved ' ...
			'in metadata.'], str{1});
			end

			% Find the index of time label. We do not supply a default
			% value for the end of the list in case the length was changed
			% over the course of function execution.
			if ismember('index', p.UsingDefaults)
			ind = length(this.TimeLabels)+1;
			else
			ind = p.Results.index;
			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 this.save_cont
			saveMetadata(this);
			end
			end

			function deleteTimeLabel(this, ind)
			this.TimeLabels(ind) = [];

			if this.save_cont
			saveMetadata(this);
			end
			end

			% Show the list of labels in a readable format
			function lst = printTimeLabels(this)
			if isempty(this.TimeLabels)
			lst = {};
			return
			end

			if ~isempty(this.timestamps)

			% Select only those time labels that are within
			% the interval of time of currently stored data
			t_ind = ([this.TimeLabels.time] >= this.timestamps(1));
			Tl = this.TimeLabels(t_ind);
			else
			Tl = this.TimeLabels;
			end

			% The returned output is a list of character strings
			lst = cell(length(Tl), 1);

			for i = 1:length(Tl)
			if ~isempty(Tl(i).text_str)

			% Display the first line of label
			lbl = Tl(i).text_str{1};
			else
			lbl = '';
			end
			lst{i} = [Tl(i).time_str, ' ', lbl];
			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).BgLines);
			end
			this.PlotList(:) = [];

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

			% Switch off continuous saving to prevent the overwriting of
			% previously saved data
			this.save_cont = false;
			end

			% Convert the log channel record to trace
			function Trace = toTrace(this, varargin)
			p = inputParser();

			addParameter(p, 'channel', 1, ...
			@(x)assert(x>0 && floor(x)==x && x<=this.channel_no, ...
			['Channel number must be an integer between 1 and ' ...
			num2str(this.channel_no) '.']));

			addParameter(p, 'index', []);

			% If false, the beginning of x data in the trace is shifted to
			% zero
			addParameter(p, 'absolute_time', false, @islogical);

			parse(p, varargin{:});

			n_ch = p.Results.channel;

			Trace = MyTrace();

			if ismember('index', p.UsingDefaults)
			Trace.x = this.timestamps_num;
			Trace.y = this.data(:, n_ch);
			else
			Trace.x = this.timestamps_num(p.Results.index);
			Trace.y = this.data(p.Results.index, n_ch);
			end

			Trace.name_x = 'Time';
			Trace.unit_x = 's';

			if ~p.Results.absolute_time

			% Shift the beginning of data to zero
			Trace.x = Trace.x-Trace.x(1);
			end

			if length(this.data_headers) >= n_ch

			% Try extracting the name and unit from the column header.
			% The regexp will match anything of the format 'x (y)' with
			% any types of brackets, (), [] or {}.
			tokens = regexp(this.data_headers{n_ch}, ...
			'(.)[\(\[\{](.)[\)\]\}]', 'tokens');

			if ~isempty(tokens)

			% Removes leading and trailing whitespaces
			tokens = strtrim(tokens{1});

			Trace.name_y = tokens{1};
			Trace.unit_y = tokens{2};
			else
			Trace.name_y = this.data_headers{n_ch};
			end
			end
			end
			end

			methods (Access = public, Static = true)

			% Load log from file. Formatting parameters can be supplied as
			% varargin
			function L = load(filename, varargin)
			assert(exist(filename, 'file') == 2, ...
			['File ''', filename, ''' is not found.'])

			L = MyLog(varargin{:});
			L.file_name = filename;

			% Load metadata if file is found
			if exist(L.meta_file_name, 'file') == 2
			Mdt = MyMetadata.load(L.meta_file_name,L.metadata_opts{:});
			setMetadata(L, Mdt);
			else
			disp(['Log metadata file is not found, continuing ' ...
			'without it.']);
			end

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

			% Assign column headers
			if length(dat_col_heads) > 1
			L.data_headers = dat_col_heads(2:end);
			end

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

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

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

			L.FirstSaveTime = L.timestamps(1);
			end
			end

			methods (Access = protected)

			% Add time labels on the plot given the plot index in PlotList
			function plotTimeLabels(this, ind)
			Axes = this.PlotList(ind).Axes;

			if ~isempty(this.timestamps) && ~isempty(this.TimeLabels)

			% Select for plotting only those time labels that are within
			% the interval of time of currently stored data
			t_ind = ([this.TimeLabels.time] >= this.timestamps(1));
			Tl = this.TimeLabels(t_ind);
			else
			Tl = this.TimeLabels;
			end

			% Plot labels
			for i = 1:length(Tl)
			T = Tl(i);
			n_lines = max(length(T.text_str), 1);

			try
			Lbl = this.PlotList(ind).LbLines(i);

			% Update the existing label line
			Lbl.Value = T.time;
			Lbl.Label = T.text_str;
			Lbl.Visible = 'on';

			% Update the background width - font size times the
			% number of lines
			Bgl = this.PlotList(ind).BgLines(i);
			Bgl.Value = T.time;
			Bgl.LineWidth = Lbl.FontSize*n_lines;
			Bgl.Visible = 'on';
			catch

			% Add new background line
			this.PlotList(ind).BgLines(i) = xline(Axes, T.time, ...
			'LineWidth', 10*n_lines, ...
			'Color', [1, 1, 1]);

			% Add new label line
			this.PlotList(ind).LbLines(i) = xline(Axes, T.time, ...
			'-', T.text_str, ...
			'LineWidth', 0.5, ...
			'LabelHorizontalAlignment', 'center', ...
			'FontSize', 10);
			end
			end

			% Remove redundant markers if any
			n_tlbl = length(Tl);

			if length(this.PlotList(ind).LbLines) > n_tlbl
			delete(this.PlotList(ind).LbLines(n_tlbl+1:end));
			this.PlotList(ind).LbLines(n_tlbl+1:end) = [];
			end

			if length(this.PlotList(ind).BgLines) > n_tlbl
			delete(this.PlotList(ind).BgLines(n_tlbl+1:end));
			this.PlotList(ind).BgLines(n_tlbl+1:end) = [];
			end
			end

			% Ensure the log length is within length limit
			function trim(this)
			len = length(this.timestamps);

			if len <= this.length_lim
			return
			end

			% Remove data points beyond the length limit
			dn = len-this.length_lim;
			this.timestamps(1:dn) = [];
			this.data(1:dn, :) = [];

			if isempty(this.TimeLabels)
			return
			end

			% Remove only the time labels which times fall outside the
			% range of both a) trimmed data b) data in the current file
			BeginTime = min(this.timestamps(1), this.FirstSaveTime);
			ind = ([this.TimeLabels.time] < BeginTime);
			this.TimeLabels(ind) = [];
			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 = ([this.PlotList.Axes] == Ax);

			% Find the index of 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

			% Create metadata from log properties
			function Mdt = getMetadata(this)
			if ~isempty(this.FirstSaveTime)

			% Select for saving only those time labels that are within
			% the interval of time of data in the current file
			ind = ([this.TimeLabels.time] >= this.FirstSaveTime);
			Tl = this.TimeLabels(ind);
			else
			Tl = this.TimeLabels;
			end

			if ~isempty(Tl)

			% Add the textual part of TimeLabels structure
			Mdt = MyMetadata(this.metadata_opts{:}, ...
			'title', 'TimeLabels');

			Lbl = struct('time_str', {Tl.time_str}, ...
			'text_str', {Tl.text_str});
			addParam(Mdt, 'Lbl', Lbl);
			else
			Mdt = MyMetadata.empty();
			end
			end

			% Save log metadata, owerwriting existing
			function saveMetadata(this, Mdt)
			if exist('Mdt', 'var') == 0
			Mdt = getMetadata(this);
			end

			if isempty(Mdt)
			return
			end

			metfilename = this.meta_file_name;

			% Create or clear the file
			stat = createFile(metfilename, 'overwrite', true);
			if ~stat
			return
			end

			save(Mdt, metfilename);
			end

			% Process metadata
			function setMetadata(this, Mdt)

			% Assign time labels
			Tl = titleref(Mdt, 'TimeLabels');
			if ~isempty(Tl)
			Lbl = Tl.ParamList.Lbl;
			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
			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

			function set.save_cont(this, val)
			this.save_cont = logical(val);
			end

			function set.file_name(this, val)
			assert(ischar(val),'''file_name'' must be a character string.')

			if ~isequal(this.file_name, val)

			% Reset the first saved timestamp marker
			this.FirstSaveTime = datetime.empty(); %#ok<MCSUP>
			end

			this.file_name = 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 val = get.channel_no(this)
			if isempty(this.data)
			val = length(this.data_headers);
			else
			[~, val] = size(this.data);
			end
			end
			end
			end

rINSTCONTROL/@MyLog/MyLog.m
151808b8e14fconfint-fix

MyLog.m
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rINSTCONTROL/@MyLog/MyLog.m151808b8e14fconfint-fix

MyLog.mView Options

rINSTCONTROL/@MyLog/MyLog.m
151808b8e14fconfint-fix

MyLog.m
View Options