[Numpy-discussion] Linear least squares
Till Stensitzki
mail.till@gmx...
Thu Jan 10 05:05:52 CST 2013
>
> QR without column pivoting is a nice option for
>"safe" problems, but it doesn't
>provide a reliable indication of rank
>reduction. I also don't find pinv useful
>once the rank goes down, since it relies on
> Euclidean distance having relevance in
>parameter space and that is seldom a sound
>assumption, usually it is better to
>reformulate the problem or remove a column
> from the design matrix.
Oh, i always taught that lstsq is more or less using the same procedure
as pinv. Maybe you can give me a hint which algorithm is the most stable,
as system (sum of expontials) is not very stable? My numerical lectures
were some year ago.
greetings Till
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