App designer Edit field, position

                       thisFrame = read(vid, framesToRead(h));
                       pos1=app.CTRLVEditField.Value
                       str = strrep(pos1, '[', ''); % Odstranění závorek
                       str = strrep(str, ']', '');
                       values= split(str, ','); % Rozdělení řetězce podle čárky
                       pos = str2double(pos1) % Převod na čísla
                       cr=imcrop(thisFrame,pos);

Hello, I work in App designer, where I put into Edit filed the area I would like to crop in this type [1 2 3 4], but in the position cr=imcrop ... the matlab says

Error using images.internal.crop.parseInputsOverTwo>validateRectangle

Input number 2, RECT, is expected to contain 4 elements.

Error in images.internal.crop.parseInputsOverTwo (line 54)

validateRectangle(spatial_rect,2);

Error in imcrop (line 104)

images.internal.crop.parseInputsOverTwo(varargin{:});

How can I solve this problem. Thank you.

Answer 1

[Voss]

pos1 = "[1 2 3 4]";

pos = str2num(pos1)

pos = 1×4

1 2 3 4

[Eliska Paulikova]

Thank you

[Voss]

You're welcome!