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question about fun defining

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Andrea
Andrea 2012-7-17
关闭： MATLAB Answer Bot 2021-8-20
I want to create this fun as below:
R=rand(100);
diff=rand(25);
sum_r1=rand(25);;
fun =@(x) x(:)+x(:).*diff(:)./sum_r1(:);
R_im=nlfilter(R,[2 2],fun);
In fact, I want to add the amount of (diff/sum_r1).x(:) in each neighborhood of 2 by 2 to x(:); I mean I have 1 diff and 1 sum_r1 for every 2 by 2 neighborhood of R. But it gives me an error!
Can anybody please help me?
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Walter Roberson
Walter Roberson 2012-7-17
编辑：Walter Roberson 2012-7-17
In your code, you do not have 1 diff and 1 sum_r1 for each 2 x 2 neighborhood in R: in your code, you have 1 diff and 1 sum_r1 total
Also, watch out: there are 2500 non-overlapping 2 x 2 neighborhoods in a 100 x 100 matrix, not merely 25. And nlfilter() does sliding windows, not non-overlapping windows.
Perhaps you should consider using blkproc() instead of nlfilter()
Andrea
Andrea 2012-7-17
Thanks. I will give it a try.

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