How to reflect the element above the diagonal of a matrix to the lower diagonal ?

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Tuong Nguyen Minh
Tuong Nguyen Minh 2020-7-17
编辑： Matt J 2020-7-19
How could I reflect all the upper element of a square matrix of size K = 3 to the lower side
Like this ?
Thank you very much

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Matt J
Matt J 2020-7-17
编辑：Matt J 2020-7-17
b=triu(a)+triu(a,1).'; %the result
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Tuong Nguyen Minh
Tuong Nguyen Minh 2020-7-19
Why we use triu(a,1).' with the dot instead of triu(a,1)'
When I check it there was not much different, but is this dot usage a prefer engineering practice ?

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