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sparse matrix division (least squares)

From: Rishi Amrit
Subject: sparse matrix division (least squares)
Date: Mon, 30 Mar 2009 11:05:02 -0500


    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 ?



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