distance between the rows of a matrix and the mean

Question

pavlos 2012-2-29

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/30718-distance-between-the-rows-of-a-matrix-and-the-mean

采纳的回答： Walter Roberson

Hello,

Consider a 100x20 matrix.

How`s the euclidean distance between each row (1x20) and the mean (average) of the rows (1x20) is calculated?

Thank you.

Best,

Pavlos

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

Walter Roberson 2012-2-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/30718-distance-between-the-rows-of-a-matrix-and-the-mean#answer_39188

在 MATLAB Online 中打开

For the situation you describe:

size = nthroot(sum(realpow(bsxfun(@plus,-Rows,mean(Rows)),ndims(Rows)),ndims(Rows)),ndims(Rows));

There are more compact ways to express this, and there are code sequences that are faster, but this particular code sequence is constructed for higher accuracy.

(This particular code sequence is also constructed to be a heartache to anyone using it for homework without understanding it thoroughly. Markers will not be amused.)

2 个评论
显示无隐藏无

pavlos 2012-3-1

Thank you very much.

It works great, but the code line is to long to include it

in a script file.

Best,

Pavlos

Walter Roberson 2012-3-1

The line length restriction in script files and function files is about 40000 characters.

Besides, if you are doing an assignment that prohibits you from writing function files, then you have bigger problems to deal with than a long line of code.

请先登录，再进行评论。