Re: Matrix left division in .oct file

[Laurent Hoeltgen]

Am 21.02.2015 um 19:52 schrieb babelproofreader:
> I'd like to code the Octave code below ( X is a matrix, y a vector )
>
> w = ( ( X' * X ) \ X' ) * y ;
>
> in a .oct file, but my standard reference for things C++/.oct at
> http://wiki.octave.org/Tips_and_tricks doesn't say how to do this. Any
> hints?
>
>
>
>
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Hi,

are you trying to solve a linear least squares problem? I'm pretty sure 
that octave has more efficient ways to handle this task than to compute 
( X' * X ) \ X'. Especially if X is large and a full matrix, then this 
computation will be pretty expensive.

Regards,
Laurent