modifying an identity matrix

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cgo
cgo on 9 Aug 2022
Answered: Walter Roberson on 9 Aug 2022
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

Accepted Answer

Walter Roberson
Walter Roberson on 9 Aug 2022
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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