errors in my code

the reset and complement functions don't work even though I wrote the codes for them correctly

app.UIAxes.cla;
            app.UIAxes2.cla;
            app.img = "";
            app.img2 = "";
            
            app.img2 = imcomplement(app.img);
            imshow(app.img2 , 'Parent', app.UIAxes2);

Answer 1

[Image Analyst]

Not sure of your definition of "correctly". Yes, that won't give a syntax error, but it's not correct.

You are setting two global variables (fields of the global app variable): img and img2. These are set to the null string.

imcomplement takes an image variable as an input -- an actual numerical matrix, not a character string.

[nour]

So how should I solve this problem?

[Image Analyst]

Did you try just deleting these two lines:

app.img = "";
app.img2 = "";

If those fields are really image arrays, then it should work, once you don't redefine them to be null strings.

[nour]

this what happens when I press the resetbutton

[Image Analyst]

Try

cla(app.UIAxes);

[nour]

it worked thank you very much