How can I select all the nonzero elements of a matrix and give out a matrix?

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Simon 2012-10-26

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采纳的回答： Andrei Bobrov

How can I select all the nonzero elements of a matrix and give out a matrix?

MatrixAo = find(MatrixA(:)~=0)

This only gives the indices back... Is there any better command?

Thanks a lot!

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José-Luis 2012-10-26

And regarding your previous question: don't use globals, you will save someone (probably yourself) a world of hurt in the future.

Simon 2012-10-26

I will remember this advice!

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Andrei Bobrov 2012-10-26

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在 MATLAB Online 中打开

MatrixAo = MatrixA(abs(MatrixA) > eps(100));

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José-Luis 2012-10-26

Because of numerical precision issues.

Andrei Bobrov 2012-10-26

Hi, Jose! Yes, it as arbitrary, from my experience.

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José-Luis 2012-10-26

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编辑：José-Luis 2012-10-26

在 MATLAB Online 中打开

your_mat = A(A~=0);

And if you want a sparse matrix:

your_mat = sparse(A);

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Simon 2012-10-26

Thanks :)

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Sachin Ganjare 2012-10-26

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Try this:

MatrixAo = MatrixA(MatrixA~=0)

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Simon 2012-10-26

Thanks!

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