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

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Tuong Nguyen Minh 2020-7-17

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编辑： Matt J 2020-7-19

采纳的回答： Matt J

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 2020-7-17

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编辑：Matt J 2020-7-17

在 MATLAB Online 中打开

b=triu(a)+triu(a,1).'; %the result

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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 ?

Matt J 2020-7-19

编辑：Matt J 2020-7-19

.' means transpose

https://www.mathworks.com/help/matlab/ref/transpose.html

Without the dot, it is conjugate tranpose

https://www.mathworks.com/help/matlab/ref/ctranspose.html

As long as your matrices are real-valued, they should give the same result.

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MATLAB Language Fundamentals Matrices and Arrays Operating on Diagonal Matrices

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