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Analysing multiple images in a forloop, problem with name recognition.

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I need to evaluate the greyscale of several images, I use the command "improfile" to do this. Since there are several images that need to be evaluated I decided to use a for loop. However I'm having some problem with the name recognition of my images. The code I've written is:

cd test
A=dir('*.bmp');
x = [300,1000];
y = [512,512] ;
G = length(A);
for n=1:G
    eval(['M' num2str(n) '=imread(A(n).name);']);
end

for i=1:G
    improfile(M num2str(G),x,y),grid on;
end

for some reason I do not understand it fails to accept the num2str(G) syntax in second for loop. If someone can help me out that would be great

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