[SciPy-user] Creating a sparse matrix

Robert Cimrman cimrman3@ntc.zcu...
Thu Dec 13 07:03:14 CST 2007


Nils Wagner wrote:
> Hi all,
> 
> How can I build a sparse matrix from the following array ?
>>>> data
> array([['1', '1', '1.7244067583090530E+05'],
>         ['1', '2', '4.7526228631699840E+04'],
 > ...
>         ['18', '24', '-1.0245630931609220E+03'],
>         ['24', '24', '4.2234547103090340E+03']],
>        dtype='|S23')
> 
> data contains information about row, column and the 
> corresponding entry.
> 
> Any pointer would be appreciated.

You read the data from a file, right? You should convert the row/column 
indices to integers and values to floats during the reading. Then you 
would have your data ready for the COO matrix constructor.

r.



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