MATLAB: failed creating a diagonal matrix

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Dastageer Khan
Dastageer Khan 2021-11-11
编辑： James Tursa 2021-11-11
I have to make a diagonal matrix using diag command in Matlab, the numbers of the main diagonal are 1,2 and 3 . I have tried typing this code:
x=[1 2 3]; matriz=diag(x)
matriz =
1 2 3
but there is not the diagonal 3x3 matriz, please, could you help me solving this problem? Thanks! PS. As far as I'm concerned, it is supposed to show this:
B=[1 0 0;0 2 0;0 0 3]
B =
1 0 0
0 2 0
0 0 3

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回答（1 个）

James Tursa
James Tursa 2021-11-11
编辑：James Tursa 2021-11-11
You probably have inadvertently created a variable named 'diag' in your workspace, and hence diag(x) is simply indexing into this variable. Clear that variable from your workspace and use a different name in the future. To confirm that this is the problem you can type the following:
which diag

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