How do a custom icon to appear in the message box?

this is the error:

SWITCH expression must be a scalar or string constant.

Error in msgbox (line 120) switch(IconString)

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when I type in the code:

myicon = imread('face.jpg');

uiwait(msgbox({'It is equal to 0!' ' ' 'Press enter to exit.'},'custom',myicon,'modal'))

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I have the image saved in the correct file and everything, but i get the same error no matter what i do :(

Answer 1

[Image Analyst]

Cool! I didn't know you could use custom icons. However, the 'custom' argument must be arguemtn 3, not argument 2 like you have it. You probably didn't notice because you tried to pack too many things into one line and it became a confusing mess that is hard to maintain or understand. Try this:

rgbImage = imread('peppers.png');
myIcon = imresize(rgbImage, [64, 64]);
userPrompt = sprintf('It is equal to 0!\nClick OK to exit.\nHere is my custom icon');
msgbox(userPrompt, 'LOOK!!!', 'custom', myIcon); % Note: custom is arg 3 now!

[Jason]

Well Image Analyst, very good answer! Thank you ,

But how can I insert an image from my computer. I think peppers.png for example are something like "built-in" images in Matlab?

[Image Analyst]

Jason, simply replace 'peppers.png' by the filename of your image.