[petsc-users] Reading matrices into PETSc

[Gaurish Telang]

I am sorry, but I am not yet clear on how to do this. I read ex32.c and
ex72.c but I am still confused. What is ASCII 'slap' format? How should
matrix be supplied to PETSc?

My matrix is a 2000x1900 matrix given in the format MATLAB stores sparse
matrices. i.e    [row, column, non-zero-entry] format.



On Tue, Dec 21, 2010 at 11:03 PM, Gaurish Telang <gaurish108 at gmail.com>wrote:

> i have this large text file containing a matrix.
>   This text file contains the non-zero entries of a very large sparse
> matrix
>
> The first two columns indicate the position of the non-zero entry
>   and the last column the actual non-zero value it self
>
> for
> example the matrix
>   1 0 8
>   0 0 5
>   6 0 0
>   is written in the text file in the form of
>   1 1 1
>   1 3 8
>  2 3 5
>   3 1 6
>
> This is the standard  [(row ,column),  non-zero] entry format.  i want
> PETSc to load this matrix
>   from the text file
>   i am not sure how
>   to do that. What commands do I use?
>
> I am new to PETSc, so some detail in the explanation will be really
> helpful.
>
> Sincere thanks,
>
> Gaurish.
>
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