find min or max value element from more than two matrices

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Sanaz
Sanaz 2014-6-2
评论： Sanaz 2014-6-2
I know how we can find min or max value element from two matrices. For more than two matrices we can do two by two and then compare but I was wondering if there is any other simple way to find min or max value element from more than two matrices?

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采纳的回答

George Papazafeiropoulos
编辑：George Papazafeiropoulos 2014-6-2
% data
matrix1=rand(2);
matrix2=rand(3);
matrix3=rand(4);
% engine
c=nan(4,4,3);
c(1:2,1:2,1)=matrix1;
c(1:3,1:3,2)=matrix2;
c(1:4,1:4,3)=matrix3;
% result
d=min(c,[],3)
e=max(c,[],3)
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Image Analyst
Image Analyst 2014-6-2
Are you sure? It's not what you asked for. You didn't say that you wanted an array of maxes and an array of mins after the individual arrays were all lined up in the upper left corner. And the values will depend on where you align the smaller matrices over the larger matrices.
Sanaz
Sanaz 2014-6-2
I changed it a little bit and I used that like: a=rand(3,3); b=rand(3,3); c=rand(3,3); d(:,:,1)=a;d(:,:,2)=b;d(:,:,3)=c; and the minimum=min(d,[],3) (the result has the same size of a or b or c).

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更多回答（1 个）

Image Analyst
Image Analyst 2014-6-2
For 3 matrices, you can do
minValue = min([a(:);b(:);c(:)])
maxValue = max([a(:);b(:);c(:)])
It's easy to see how to adapt it for more matrices.
  2 个评论
dpb
dpb 2014-6-2
编辑：Image Analyst 2014-6-2
Good 'un to use (:) to avoid the dimensions problem...don't know why didn't think of it. I removed the sorrier response.

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