For loop error in App Designer

1. image add button

global k;

global str2num;

file=uigetfile('*.*', 'select a single file at a time', 'download', 'MultiSelect','on');

k=length(file);

str2num();

2. filter button

global k;

for q = 1:k

c = char((file(q)));

imagec = imread(c);

imagec_=imagec(:,:,1);

mask=[-1 -1 -1; -1 9 -1;-1 -1 -1];

sharp_imagec_=imfilter(imagec_,mask);

imgchange(:,:,1)=sharp_imagec_;

imwrite(imgchange,strcat('gray',num2str(q),'.jpg')); %%각각 이미지를 저장

end

The above code is written in the app designer. The problem is that on execution, c = char((file(q))); This is where the double-type problem occurs. Script works fine, but App Designer doesn't.What can I do to fix it?

Answer 1

[Image Analyst]

file is not in scope in your second button. You can make it a global variable by attaching to the app structure so in the first "add" function, or by using the global keyword

app.file=uigetfile('*.*', 'select a single file at a time', 'download', 'MultiSelect','on');
k=length(app.file);

then in the second "filter" function use app.file

c = char((app.file(q)));