sparse matrix division (least squares)

[Ben Abbott]

On Mar 30, 2009, at 12:05 PM, Rishi Amrit wrote:

> Hi,
>
>    I have two sparse matrices (say A and B).
>
> > size(A)
> ans =
>    2400  2400
>
> > size(B)
> ans =
>    2400 2440
>
> I wish to implement the least squares operator : A\B
>
> When I run this in MATLAB, I get
>
> > size(A\B)
> ans =
>   2440  2400
>
> and A\B is a sparse matrix.
>
> When I implement this in octave, I get
>
> > A\B
> ans = Compressed Column Sparse (rows = 0, cols =0, nnz = 0)
>
> which is empty.
>
> Is there a separate function in octave for this operation on sparse  
> matrices ?
>
> Thanks,
>
> Rishi

What version of Octave are you running?

Ben