Extract non-zero elements from matrix with double precision numbers

5 次查看（过去 30 天）
Peter
Peter 2013-5-15
How can I extract all of the non-zero number from a matrix? I tried using the function nonzero(M), but since the values in the matrix are all decimals, I got the error "Undefined function 'nonzero' for input arguments of type 'double' ".
I just wand a row vector (or column vector, or whatever is easiest) of all non-zero elements. Obviously I can just loop through each element, but this is insanely inefficient.

请先登录，再回答此问题。

采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-5-15
out=M(M~=0)

更多回答（1 个）

Matt Kindig
Matt Kindig 2013-5-15
编辑：Matt Kindig 2013-5-15
notZeros= M(M~=0);
Keep in mind that due to numerical precision, some of your matrix elements may be small but not identically zero. You might want to use some sort of tolerance instead, such as:
notZeros = M(abs(M)<10*eps); %for example

类别

在 Help Center 和 File Exchange 中查找有关 Logical 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by