After using triu, how do I exclude the 0s in the vector?

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Lakyn 2016-8-23

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评论： Walter Roberson 2016-8-23

Hi all, So my matrix, lets call it A is 76x76, and I only want the top triangular corner(without the main diagonal line). I managed to get everything right, but the numbers that I don't want (lower triangle) still appears as 0, how do I remove it? My code is as below.

function M = vector2(A)

B = triu(A,1)

M = reshape(B, [] ,1)

This makes my matrix into a vector which is what I want, but there are still 0s in place of the numbers that I don't want, when I want it to just disappear completely. Please help.

Thank you very much!

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James Tursa 2016-8-23

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https://ww2.mathworks.cn/matlabcentral/answers/300657-after-using-triu-how-do-i-exclude-the-0s-in-the-vector#answer_232597

在 MATLAB Online 中打开

M = A(triu(true(size(A)),1));

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James Tursa 2016-8-23

Yep ... I didn't notice this was a repeat Question.

Walter Roberson 2016-8-23

And I had already given that solution a couple of days ago when I listed off three ways of extracting the outputs from the pairwise averages for a previous question.

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