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Re: lsqr: some guidance requested
From: |
c. |
Subject: |
Re: lsqr: some guidance requested |
Date: |
Fri, 2 Dec 2016 11:49:49 +0100 |
On 1 Dec 2016, at 19:55, Nicholas Jankowski <address@hidden> wrote:
> On Thu, Dec 1, 2016 at 9:59 AM, Marco Atzeri <address@hidden> wrote:
>>
>> Left division already offer "a minimum norm solution"
>>
>> https://www.gnu.org/software/octave/doc/interpreter/Simple-Examples.html#Matrix-Arithmetic
>
>
> in the interest of having a matlab compatible syntax and output is
> there a way a wrapper could be made to force \ to use a least squares
> solution algorithm? I assume it currently follows some decision tree.
> Also, more to Ruben's question, how optimized is \ for sparse A
> matrices?
>
Here is the decision tree for mldivide on sparse matrices:
https://www.gnu.org/software/octave/doc/v4.0.0/Sparse-Linear-Algebra.html
Essentially all optimization is delegated to CHOLMOD or UMFPACK.
c.