Perofrming statistics over non-zero elements of mXn array

Question

Saeid 2017-2-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/324376-perofrming-statistics-over-non-zero-elements-of-mxn-array

编辑： Adam 2017-2-10

I would like to perform statistics, e.g. averaging (or any other function, for that matter), over the non-zero elements of an mXn array with more than one column. For example:

so that the result will then be a vector of length n. How is this possible without using a for/loop?

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。

Answer 1

Adam 2017-2-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/324376-perofrming-statistics-over-non-zero-elements-of-mxn-array#answer_254210

在 MATLAB Online 中打开

array( array == 0 ) = NaN;
nanmean( array )

2 个评论
显示无隐藏无

Saeid 2017-2-10

I need to have the financial or statistic toolbox to perform this.

Adam 2017-2-10

编辑：Adam 2017-2-10

在 MATLAB Online 中打开

If you have a recent enough version of Matlab then

mean( array, 'omitnan' )

should do the same. It is hard to find out when additions like this were made to functions that have been around for ages though, unlike brand new functions where we can tell from the 'Introduced...' text at the bottom of the documentation page.

Looks like you need R2015a or later for this version of mean

请先登录，再进行评论。