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modifying an identity matrix

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cgo
cgo 2022-8-9
回答： Walter Roberson 2022-8-9
I have an identity matrix. I want to put a '1' on the zeros that are right infront of the main diagonal, except at the very last '1'.
Is there an easy way to do it

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Walter Roberson
Walter Roberson 2022-8-9
Ran in:
I = eye(7)
I = 7×7
1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1
r = size(I,1);
newI = diag([ones(1,r-2), 0],-1) + I
newI = 7×7
1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 1

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