distance between the rows of a matrix and the mean

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

Answer 1

[Walter Roberson]

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.)

[pavlos]

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]

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.