[ENH] Add plot_events for quick dataset visualization

+bids/+util/plot_events.m

@@ -0,0 +1,189 @@
+function plot_events(varargin)
+  %
+  % USAGE::
+  %
+  %   plot_events(events_files, 'filter', filter)
+  %
+  % :param events_files: BIDS events TSV files.
+  % :type events_files: path or cellstr of paths
+  %
+  % :param filter: Restrict conditions to plot.
+  % :type filter: string or cellstr
+  %
+  % EXAMPLE::
+  %
+  %   data_dir = fullfile(get_test_data_dir(), 'ds108');
+  %
+  %   BIDS = bids.layout(data_dir);
+  %
+  %   events_files = bids.query(BIDS, ...
+  %                             'data', ...
+  %                             'sub', '01', ...
+  %                             'run', '01', ...
+  %                             'suffix', 'events');
+  %
+  %   filter = {'Reapp_Neg_Cue', 'Look_Neg_Cue', 'Look_Neutral_Cue'};
+  %   bids.util.plot_events(events_files, 'filter', filter);
+  %
+  %
+  % (C) Copyright 2020 Remi Gau
+
+  % TODO add reponse_time column
+
+  args = inputParser();
+
+  file_or_cellstring = @(x) (iscellstr(x) || exist(x, 'file'));
+  char_or_cellstring = @(x) (ischar(x) || iscellstr(x));
+
+  addRequired(args, 'events_files', file_or_cellstring);
+  addParameter(args, 'filter', {}, char_or_cellstring);
+
+  parse(args, varargin{:});
+
+  events_files = args.Results.events_files;
+  filter = args.Results.filter;
+
+  if ischar(filter)
+    filter = {filter};
+  end
+
+  if ischar(events_files)
+    events_files = {events_files};
+  end
+
+  for i = 1:numel(events_files)
+    plot_this_file(events_files{i}, filter);
+  end
+
+end
+
+function plot_this_file(this_file, filter)
+
+  bids_file = bids.File(this_file);
+
+  fig_name = strrep(bids_file.filename, '_', ' ');
+  fig_name = strrep(fig_name, 'events.tsv', ' ');
+
+  data = bids.util.tsvread(this_file);
+
+  trial_type = data.trial_type;
+  if ~isempty(filter)
+    trial_type_list = filter;
+  else
+    trial_type_list = unique(trial_type);
+  end
+
+  xMin = floor(min(data.onset)) - 1;
+  xMax = ceil(max(data.onset + data.duration));
+
+  yMin = 0;
+  yMax = 1;
+
+  nb_col = 8;
+  nb_rows = numel(trial_type_list);
+
+  figure('name', fig_name, ...
+         'position', [50 50 2000 1000]);
+
+  subplot_col_1 = 1:(nb_col - 1);
+  subplot_col_2 = nb_col;
+
+  for iCdt = 1:numel(trial_type_list)
+
+    idx = strcmp(trial_type, trial_type_list{iCdt});
+
+    onsets = data.onset(idx);
+
+    durations = data.duration(idx);
+
+    if isfield(data, 'response_time')
+      response_times = data.response_time(idx);
+    else
+      response_times = nan(size(onsets));
+    end
+
+    %% Time course
+    subplot(nb_rows, nb_col, subplot_col_1);
+
+    hold on;
+
+    if all(durations == 0)
+
+      stem(onsets, ones(1, numel(onsets)), 'r');
+
+    else
+
+      for iStim = 1:numel(onsets)
+
+        offsets = onsets(iStim) + durations(iStim);
+        xMax = max([xMax; offsets]);
+
+        rectangle('position', [onsets(iStim) 0 durations(iStim) 1], ...
+                  'FaceColor', 'r');
+      end
+
+    end
+
+    % add response time
+    response_times = onsets + response_times;
+    has_response = ~isnan(response_times);
+    if any(has_response)
+      stem(response_times(has_response), 0.5 * ones(1, sum(has_response)), 'k');
+    end
+
+    ylabel(sprintf(strrep(trial_type_list{iCdt}, '_', '\n')));
+
+    %% Duration distribution
+    subplot(nb_rows, nb_col, subplot_col_2);
+
+    hold on;
+
+    hist(diff(onsets));
+
+    ax = axis;
+    plot([0 0], [ax(3) ax(4)], 'k');
+    plot([ax(1) ax(2)], [0 0], 'k');
+
+    %% Increment
+    subplot_col_1 = subplot_col_1 + nb_col;
+    subplot_col_2 = subplot_col_2 + nb_col;
+
+  end
+
+  %% Update axis
+  xMax = xMax + 5;
+
+  subplot_col_1 = 1:(nb_col - 1);
+  for iCdt = 1:numel(trial_type_list)
+
+    subplot(nb_rows, nb_col, subplot_col_1);
+
+    axis([xMin xMax yMin yMax]);
+
+    % x tick in minutes
+    set(gca, ...
+        'xTick', 0:60:xMax, ...
+        'xTickLabel', '', ...
+        'TickDir', 'out');
+
+    subplot_col_1 = subplot_col_1 + nb_col;
+
+  end
+
+  subplot(nb_rows, nb_col, 1:(nb_col - 1));
+  title(fig_name);
+
+  subplot(nb_rows, nb_col, [1:(nb_col - 1)] + (nb_col * (nb_rows - 1))); %#ok<NBRAK>
+  set(gca, ...
+      'xTick', 0:60:xMax, ...
+      'xTickLabel', 0:60:xMax, ...
+      'TickDir', 'out');
+  xlabel('seconds');
+
+  subplot(nb_rows, nb_col, nb_col);
+  title('ISI distribution');
+
+  subplot(nb_rows, nb_col, nb_rows * nb_col);
+  xlabel('seconds');
+
+end

tests/tests_utils/test_plot_events.m

@@ -0,0 +1,45 @@
+function test_suite = test_plot_events %#ok<*STOUT>
+  try % assignment of 'localfunctions' is necessary in Matlab >= 2016
+    test_functions = localfunctions(); %#ok<*NASGU>
+  catch % no problem; early Matlab versions can use initTestSuite fine
+  end
+  initTestSuite;
+end
+
+function test_plot_events_ds101()
+
+  close all;
+
+  data_dir = fullfile(get_test_data_dir(), 'ds001');
+
+  BIDS = bids.layout(data_dir);
+
+  events_files = bids.query(BIDS, ...
+                            'data', ...
+                            'sub', '01', ...
+                            'task', 'balloonanalogrisktask', ...
+                            'suffix', 'events');
+
+  bids.util.plot_events(events_files);
+
+end
+
+function test_plot_events_ds108()
+
+  data_dir = fullfile(get_test_data_dir(), 'ds108');
+
+  BIDS = bids.layout(data_dir);
+
+  events_files = bids.query(BIDS, ...
+                            'data', ...
+                            'sub', '01', ...
+                            'run', '01', ...
+                            'suffix', 'events');
+
+  filter = 'Reapp_Neg_Cue';
+  bids.util.plot_events(events_files, 'filter', filter);
+
+  filter = {'Reapp_Neg_Cue', 'Look_Neg_Cue', 'Look_Neutral_Cue'};
+  bids.util.plot_events(events_files, 'filter', filter);
+
+end