setappdata, where to verify?

I'm slowly progressing on my way to Matlab "nirvana"...

How would I go about checking whether an element has indeed been added to a figure object? Suppose I use this code in my script :

set(FigureH, 'Position', [1800 500 f_Largeur f_Hauteur]);

ax1 = gca;

setappdata(FigureH,'axImage', ax1);

breakpoint = 1;

Suppose I set a breakpoint right after setappdata and navigate to the Command Window and type :

>> Get(FigureH)

... to get all FigureH properties, I don't see the appdata I just created, that are supposed to be stored in the figure, according to the documentation? I was expecting, possibly, to see it in UserData[ ]?

Answer 1

[Voss]

Use

getappdata(FigureH)

to view/verify the application data associated with FigureH via setappdata().

[Roger Breton]

IOW, the appdata is not stored in the figure properties per se?

[Voss]

It is there, in a property called 'ApplicationData', which doesn't show up by default when you do get(FigureH).

f = figure();
setappdata(f,'test_app_data',1);
get(f) % no ApplicationData property listed

                 Alphamap: [0 0.0159 0.0317 0.0476 0.0635 0.0794 0.0952 0.1111 0.1270 0.1429 0.1587 0.1746 0.1905 0.2063 0.2222 0.2381 0.2540 0.2698 0.2857 0.3016 0.3175 0.3333 0.3492 0.3651 0.3810 0.3968 0.4127 0.4286 … ]
             BeingDeleted: off
               BusyAction: 'queue'
            ButtonDownFcn: ''
                 Children: [0×0 GraphicsPlaceholder]
                 Clipping: on
          CloseRequestFcn: 'closereq'
                    Color: [1 1 1]
                 Colormap: [256×3 double]
              ContextMenu: [0×0 GraphicsPlaceholder]
                CreateFcn: ''
              CurrentAxes: [0×0 GraphicsPlaceholder]
         CurrentCharacter: ''
            CurrentObject: [0×0 GraphicsPlaceholder]
             CurrentPoint: [0 0]
                DeleteFcn: ''
             DockControls: on
                 FileName: ''
        GraphicsSmoothing: on
         HandleVisibility: 'on'
                     Icon: ''
            InnerPosition: [671 661 577 433]
            IntegerHandle: on
            Interruptible: on
           InvertHardcopy: on
              KeyPressFcn: ''
            KeyReleaseFcn: ''
                  MenuBar: 'none'
                     Name: ''
                 NextPlot: 'add'
                   Number: 1
              NumberTitle: on
            OuterPosition: [671 657 577 458]
         PaperOrientation: 'portrait'
            PaperPosition: [1.3359 3.3131 5.8283 4.3737]
        PaperPositionMode: 'auto'
                PaperSize: [8.5000 11]
                PaperType: 'usletter'
               PaperUnits: 'inches'
                   Parent: [1×1 Root]
                  Pointer: 'arrow'
        PointerShapeCData: [16×16 double]
      PointerShapeHotSpot: [1 1]
                 Position: [671 661 577 433]
                 Renderer: 'opengl'
             RendererMode: 'auto'
                   Resize: on
               Scrollable: off
            SelectionType: 'normal'
           SizeChangedFcn: ''
                      Tag: ''
                  ToolBar: 'none'
                     Type: 'figure'
                    Units: 'pixels'
                 UserData: []
                  Visible: off
      WindowButtonDownFcn: ''
    WindowButtonMotionFcn: ''
        WindowButtonUpFcn: ''
        WindowKeyPressFcn: ''
      WindowKeyReleaseFcn: ''
     WindowScrollWheelFcn: ''
              WindowState: 'normal'
              WindowStyle: 'normal'
                 XDisplay: ':1.0'

get(f,'ApplicationData') % but here it is, including 'test_app_data'

ans = struct with fields:
    IsDebugFigureDirty: 1
         test_app_data: 1

Reference: https://www.mathworks.com/matlabcentral/answers/486152-where-does-the-getappdata-function-save-its-data#comment_757931