How to fast create a specific matrix

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Xiaolong
Xiaolong 2019-6-21
评论： Xiaolong 2019-6-21
I want to generate a matrix with the same pattern but different size.
pattern: for a matrix with size [4 4]
[ 0 0 0 0;
0 0 0 1;
0 0 1 2;
0 1 2 3]
The matrix is always square. The size is often more than 256 in practice. I can generate this kind of matrix using for-loop. But it's too slow.
How to fast create this kind of matrix?

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Matt J
Matt J 2019-6-21
hankel(zeros(1,4),0:3)

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