up sampling a matrix with non-zero elements.

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Andrea
Andrea 2012-7-13
Hello
I have a matrix A(100 by 100) and I want to upsample the matrix (not by zero arrays) in a way the each cell is replicated in its 3 by 3 neighborhood. So I will have a a 9 cell instead of each cell which I have had at first.
Any suggestion??
  2 个评论
Conrad
Conrad 2012-7-13
Considering the case where [A] = 2x2, you want something like this?
A = [1 2;...
3 4];
B = [1 1 1 2 2 2;...
1 1 1 2 2 2;...
1 1 1 2 2 2;...
3 3 3 4 4 4;...
3 3 3 4 4 4;...
3 3 3 4 4 4];
Andrea
Andrea 2012-7-13
yes, exactly I want something like this. So..

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回答（1 个）

Honglei Chen
Honglei Chen 2012-7-13
编辑：Honglei Chen 2012-7-13
You can use kron
A = [1 2;3 4];
B = kron(A,ones(3))

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