Index exceeds the number of array elements (0) in MATLAB app designer

hold on;

xxx = flag_array; % 1 x 60001 array

yyy = ACSurfacedeflection_class2_array; % 1 x 60001 array

h1 = area(app.UIAxes,xxx,yyy);

set(h1(1),'FaceColor','g');

idx = find((ACSurfacedeflection_class2_array>=(0.075)) & (ACSurfacedeflection_class2_array<(0.090)));

h1=area(app.UIAxes,xxx(idx),yyy(idx));

set(h1(1),'FaceColor','y');

idx = find(ACSurfacedeflection_class2_array>=(0.090));

h1=area(app.UIAxes,xxx(idx),yyy(idx));

set(h1(1),'FaceColor','r');

hold off;

title(app.UIAxes, 'Class 2 Deflection vs Time');

xlabel(app.UIAxes, 'Time (hour)');

ylabel(app.UIAxes, 'Surfacedeflection (mm)');

app.UIAxes.Visible = 'on';

I keep getting Index exceeds the number of array elements (0) error at the line "set(h1(1),'FaceColor','y');" . Does anyone know how to solve this? I wrote a seperate .m script and it works fine there. Is there a way i can check the variables directly in the MATLAB app designer as we can do while writing scripts or .m file?

Answer 1

[Mario Malic]

Hello,

You can try first getting rid of the index of h, even though it should work without it.

area is the child of UIAxes, if you have only one area plot, you can use this

set(findall(0, 'type', 'area'), 'FaceColor','y'); % First argument will return the handle to area

Otherwise, you can try changing properties with dot notation.

Area_H = findall(0, 'type', 'area')
% Area_H = app.UIAxes.Children(1) % 
Area_H.FaceColor = 'g';

You can check them if you run your app from command window, or if you use debugging (IIRC). You can access app properties

app = NameOfYourApp
app.UIAxes %example

[Vinayak Chaturvedi]

Instead of hold on;

I used hold(app.UIAxes);

this worked for me !

Also, @Mario - Getting rid of index worked for me too (although i experimented it before even you commented here). Sometimes trial and error helps. Thanks for your help!