Creating triangular matrix from a vector (with a twist)

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Catalin
Catalin il 7 Set 2015
Risposto: Matt J il 7 Set 2015
I have a vector v=[a b c d] and I want to (efficiently) create a matrix of the form : M=[a 0 0 0 ; b a 0 0 ; c b a 0 ; d c b a ]. I am experimenting with "diag" function but it does not seem to be very efficient. Any thoughts?

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Matt J
Matt J il 7 Set 2015
>> toeplitz([1 2 3 4],[1,0,0,0])
ans =
1 0 0 0
2 1 0 0
3 2 1 0
4 3 2 1

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