求助 Index exceeds matrix dimensions

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a=[imread('corl9.JPG')]
resultf=zeros(512,12);
ai=1;
for m=1:32;
for n=1:32;
blocki=a(32*(m-1)+[1:32],32*(n-1)+[1:32]);
centeri_x_y=[32*(m-1)+16,32*(n-1)+16];
[r,Nr]=fractal(blocki);
resultf(ai,:)=[centeri_x_y,r,Nr];
ai=ai+1;
%if(tempi<=1024)
%{resultf(ii,1:10)=[centeri_x_y,r,Nr];
%ii=ii+1;
% }
end
end
以上 blocki_fractal..m文件运行后，出现这样的提示：
??? Index exceeds matrix dimensions.

Error in ==> blocki_fractal at 6
blocki=a(32*(m-1)+[1:32],32*(n-1)+[1:32]);
请高手帮忙解决！谢谢！