Matrices for testing

Nils Wagner nwagner at iam.uni-stuttgart.de
Thu Oct 26 02:19:30 CDT 2006


Bill Baxter wrote:
>
> On 10/26/06, *jeremito* <jeremit0 at gmail.com
> <mailto:jeremit0 at gmail.com>> wrote:
>
>
>     Hmmm.  I guess I'll have to find another way to get some
>     "standard/well-known" matrices to work with.  Thanks for your help.
>
>
> Well if all you want is some matrices, there's nothing stopping you
> from grabbing the matrices in the LAPACK distribution and using them
> yourself.  Robert's just saying they won't be included in Numpy.
>
> There's also the matrix market, whcih has a large number of
> (sparse-only?) example matrices.
> http://math.nist.gov/MatrixMarket/index.html
>  
> --bb
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You might be also interested in the Matrix Computation Toolbox which is
a collection of MATLAB M-files containing functions for constructing
test matrices ...
http://www.ma.man.ac.uk/~higham/mctoolbox/

and
http://www.mathworks.com/access/helpdesk/help/techdoc/ref/*gallery*.html

BTW, you can easily import matrices given in the MatrixMarket format in
scipy. See* io.mmread *

mmread(source)
    Reads the contents of a Matrix Market file 'filename' into a matrix.

    Inputs:

      source    - Matrix Market filename (extensions .mtx, .mtz.gz)
                  or open file object.

    Outputs:

      a         - sparse or full matrix

Nils


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