Diagonal matrix from multiple columns of an array

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Saeid
Saeid 2018-11-4
回答： Bruno Luong 2018-11-4
I have the array
M=[a b c;
d e f;
g h i]
and I want to construct an array composed of several diagonal arrays in the form:
N=[0 a d 0 0;
0 0 b e 0;
0 0 0 c f;
g 0 0 0 0;
0 h 0 0 0]
or basically place the individual columns of M into pre-assigned positions (1 2 -3) in N. How can I do this without a loop?

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Bruno Luong
Bruno Luong 2018-11-4
Take a look at spdiags

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