a simple vector to a matrix

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MA
MA 2021-10-6
回答： Steven Lord 2021-10-6
Hello everyone,
I am trying to write a code that convert a vector like the following for example:
X=[1 2 3];
to a matrix like the following:
Z=[1 0 0 2 0 0 3 0 0;...
0 1 0 0 2 0 0 3 0;...
0 0 1 0 0 2 0 0 3];
Any ideas?
Thanks very much.

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回答（2 个）

Steven Lord
Steven Lord 2021-10-6
Ran in:
X=[1 2 3];
I = eye(3);
kron(X, I)
ans = 3×9
1 0 0 2 0 0 3 0 0 0 1 0 0 2 0 0 3 0 0 0 1 0 0 2 0 0 3
kron(I, X)
ans = 3×9
1 2 3 0 0 0 0 0 0 0 0 0 1 2 3 0 0 0 0 0 0 0 0 0 1 2 3
David Hill
David Hill 2021-10-6
X-[1 2 3];
Z=zeros(3,3*numel(X));
for k=1:numel(X)
Z(9*k:-4:9*k-8)=X(k);
end

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