How to convert for loop statement to matrix operation?

2015 8 27
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更新时间：2015 8 27
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Hi, I am very new to using Matlab. Due to the processing issue, I would like to convert for-loop statement to matrix calculation to accelerate processing time.
For example,
[u v] = size(input_img);
for i=1:u
for j=1:v
if (input_img(i,j) == 0)
temp(i,j)=0;
end
end
end
Thank you.

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James Tursa
James Tursa 2015-8-27
编辑：James Tursa 2015-8-27

0 个投票

Assuming the matrix sizes are compatible, using logical indexing:
temp( input_img == 0 ) = 0;

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