simple tagging works

MATLAB/TagPlot.m

-function [outputArg1,outputArg2] = TagPlot(figs)
+function [figs] = TagPlot(figs, prefix)
 %TagPlot adds IDs to figures
+%   The ID is placed visual on the figure window and as Tag (Property of figure)
 %   TagPlot can Tag multiple figures at once
 arguments
     figs (1,:) {mustBeFigure}
+    prefix (1,:) {mustBeText}= ''
 end
 
-for n = 1:numel(figs)
-    ID = CreateID;
+if isempty(prefix)
+    warning('no project prefix defined')
 end
 
+for n = 1:numel(figs)
+    ID = CreateID; % Create ID
+    axes = get(figs(n),'CurrentAxes'); % Axes object for text annotation
+    % Limits for relative Positioning
+    ylim =get(axes,'YLim');
+    xlim =get(axes,'XLim');
+    %ID
+    text(xlim(2),0.4*ylim(2), ID,'Fontsize',8,'Rotation',90,'VerticalAlignment','bottom',...
+    'Color', 0.65*[1 1 1],'BackgroundColor','w');
+    set(figs(n),'Tag', ID);
     
-function tf = mustBeFigure(h) %check if input is a figure object
-  tf = strcmp(get(h, 'type'), 'figure') & isa(h, 'matlab.ui.Figure');
 end
 
 end
+
+function tf = mustBeFigure(h) %checks if input is a figure object
+  tf = strcmp(get(h, 'type'), 'figure') & isa(h, 'matlab.ui.Figure');
+end