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How to do sum of diagonal element of a matrix?

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Nadhirah Jofri
Nadhirah Jofri on 8 Aug 2015
Answered: Walter Roberson on 8 Aug 2015
from what i know to do sum of diagonal element of a matrix is by:
tr(A)
but it says
Undefined function or method 'tr' for input arguments of type 'double'.
so i think i should do it manually by using the 'diag(A)'.. but...how i'm going to do 'sum of diag(A)' ?

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Answers (2)

Azzi Abdelmalek
Azzi Abdelmalek on 8 Aug 2015
trace(A)
Walter Roberson
Walter Roberson on 8 Aug 2015
sum(diag(A))

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