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Create a matrix with non zero entries on the diagonal and subdiagonal and zero elsewhere

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Zhukun Wang
Zhukun Wang 2021-3-4
回答： David Hill 2021-3-4
I am confused on how to generate a 4 by 4 matrix which has ones on the diagonal and zeroes on the lower subdiagonal right beneath the diagonal and 2s on the subdiagonal right above the diagonal. In addition, there should be 0 entries elsewhere.

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David Hill
David Hill 2021-3-4
eye(4)+diag([2 2 2],1);

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