Select positive samples in a matrice

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Miguel Albuquerque 2022-7-25

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https://ww2.mathworks.cn/matlabcentral/answers/1767585-select-positive-samples-in-a-matrice

回答： dpb 2022-7-25

Hey guys, thanks in advance,

I have this azimuth_compressed_matrix, defined by freq_azimuth(frequency) x azimuth. However I want to define this matrix only for values of freq_azimuth>0. Basically , in this example, I want to make a way to make this code I made automatic, is there a way?

k=find(freq_azimuth>0);
freq_azimuth2=freq_azimuth(4000:7999);
azimuth_compressed_matrix2=azimuth_compressed_matrix(:,4000:7999);

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Matt J 2022-7-25

Your code does not use "k" anywhere, so the intention is not clear.

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Answer 1

dpb 2022-7-25

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在 MATLAB Online 中打开

One more time, yet again, it's one of the most fundamental of MATLAB idioms/syntaxes that makes MATALB what it is -- <MatrixIndexingExample-Logical Indexing>

azimuth_compressed_matrix2=freq_azimuth(freq_azimuth>0);

Again, there's no need for find here...