Find attached a routine which reads matrix data from an ASCII file in i j value format and creates a seqaij matrix.
----- Original Message ----- 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. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20101222/0ddb21ee/attachment-0001.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: ReadMatFromFile.c Type: text/x-csrc Size: 2125 bytes Desc: not available URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20101222/0ddb21ee/attachment-0001.c>
