How can I ignore 0 values when computing the mean over the third dimensional of a 3D matrix?

23 次查看（过去 30 天）

显示更早的评论

A LL 2020-10-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/610751-how-can-i-ignore-0-values-when-computing-the-mean-over-the-third-dimensional-of-a-3d-matrix

评论： Rik 2020-10-11

采纳的回答： Asad (Mehrzad) Khoddam

Hi,

I have a 3D matrix size 951x301x720 let call it A.

I want to get a 951x301 matrix B with the mean of A over the third dimension.

I computed the mean over the third dimension with B = mean(A,3) but I have a lot of zeros in my matrix and I do not want the mean to be affected by the 0 values.

How can I ignore the 0?

Thank you

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Asad (Mehrzad) Khoddam 2020-10-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/610751-how-can-i-ignore-0-values-when-computing-the-mean-over-the-third-dimensional-of-a-3d-matrix#answer_510841

在 MATLAB Online 中打开

You can set 0 values to NaN. Then find the mean of non NaN values;

Ap=A;
Ap(Ap==0)=NaN;
B=mean(Ap,3,'omitnan')

4 个评论
显示 2更早的评论隐藏 2更早的评论

A LL 2020-10-11

Thanks!

Rik 2020-10-11

Yes, that is what I meant, thank you for correcting it.

请先登录，再进行评论。

类别

MATLAB Language Fundamentals Matrices and Arrays Resizing and Reshaping Matrices

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

Community Treasure Hunt

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

Start Hunting!

Translated by