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How can I read in or write out a sparse matrix in Matrix Market, Harwell-Boeing, SLAPC or other ASCII format?

April 26, 2017ASCII format harwell-boeing market matrix read sparse write

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How can I read in or write out a sparse matrix in Matrix Market, Harwell-Boeing, SLAPC or other ASCII format?

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See the examples in src/mat/examples/tests, specifically ex72.c and ex32.c. You will likely need to modify the code slightly to match your required ASCII format. Note: Never read or write in parallel an ASCII matrix file, instead for reading: read in sequentially then save the matrix with the binary viewer PetscBinaryViewerOpen() and load the matrix in parallel with MatLoad(); for writing save with the binary viewer and then load with the sequential code to store it as ASCII.