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how to change what is under the diagonals in a matrix into Zeros

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Brian Nuttall 2015-3-31

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回答： Matt J 2015-3-31

how do i turn what is under the diagonal on a matrix into zeros. for example i cant figure out how to do the following.

[1 2 3,4 5 6,7 8 9]

into

[1 2 3,0 5 6,0 0 9]

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Matt J 2015-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/195516-how-to-change-what-is-under-the-diagonals-in-a-matrix-into-zeros#answer_173493

See the TRIU command.

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MATLAB Language Fundamentals Matrices and Arrays Operating on Diagonal Matrices

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