试用软件

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

1 次查看（过去 30 天）

显示更早的评论

Simon 2012-10-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/51937-how-can-i-select-all-the-nonzero-elements-of-a-matrix-and-give-out-a-matrix

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!

2 个评论
显示无隐藏无

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!

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Andrei Bobrov 2012-10-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/51937-how-can-i-select-all-the-nonzero-elements-of-a-matrix-and-give-out-a-matrix#answer_63301

在 MATLAB Online 中打开

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

4 个评论
显示 2更早的评论隐藏 2更早的评论

José-Luis 2012-10-26

Because of numerical precision issues.

Andrei Bobrov 2012-10-26

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

请先登录，再进行评论。

更多回答（2 个）

José-Luis 2012-10-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/51937-how-can-i-select-all-the-nonzero-elements-of-a-matrix-and-give-out-a-matrix#answer_63298

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);

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Simon 2012-10-26

Thanks :)

请先登录，再进行评论。

Sachin Ganjare 2012-10-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/51937-how-can-i-select-all-the-nonzero-elements-of-a-matrix-and-give-out-a-matrix#answer_63300

Try this:

MatrixAo = MatrixA(MatrixA~=0)

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Simon 2012-10-26

Thanks!

请先登录，再进行评论。

请先登录，再回答此问题。

类别

MATLAB Language Fundamentals Matrices and Arrays Creating and Concatenating Matrices

在 Help Center 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Translated by

试用软件