Store value in Matrix

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Mystery Devil
Mystery Devil 2017-1-21
评论： Star Strider 2017-1-21
Hello,
I want to store the value in the matrix form using for loop.
For example: Let's say I have a matrix A (2*2 matrix)
A = [1 2;
3 4]
But the output should be:
A = [1 0 0 0
1 2 0 0
1 2 3 0
1 2 3 4]
Can somebody tell me how to do this?
Thank you very much!

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回答（2 个）

Star Strider
Star Strider 2017-1-21
One approach:
A = [1 2;
3 4];
A = A';
B = repmat(A(:)',numel(A),1);
Result = tril(B)
Result =
1 0 0 0
1 2 0 0
1 2 3 0
1 2 3 4
  2 个评论
Mystery Devil
Mystery Devil 2017-1-21
Thank you very much! This is how I wanted. It worked!

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Andrei Bobrov
Andrei Bobrov 2017-1-21
A = [1 2;
3 4];
out = tril(ones(numel(A),1)*reshape(A.',1,[]));

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