question about fun defining

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Andrea 2012-7-17

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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 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 2012-7-17