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How to do a lower triangular with ones along the diagonal ?

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z m
z m 2017-11-26
评论： z m 2017-11-26
Hello,
I want to do a lower triangular with ones along the diagonal. for example, I have 62 x 62 matrix of (binary of 1s and 0s) and wants to transfer this matrix to a lower triangular with ones along the diagonal
here, I use zeros for create A= 62 x 62 matrix and used tril(A) to get the lower triangular matrix
A=zeros(62,62);
tril(A);
I get a lower triangular matrix but how to get a lower triangular with ones along the diagonal from matrix A?
please, help me.
Thanks

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Walter Roberson
Walter Roberson 2017-11-26
Extracting the lower triangle from A and setting the main diagonal to 1:
tril(A,-1) + diag(ones(1,size(A,1))
Extracting the lower triangle from A and setting the first diagonal of the lower triangle to 1:
tril(A,-2) + diag(ones(1,size(A,1)-1),-1)

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