<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>Hello PETSc team:<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div><div>I'm doing the parallelization of the assembling of a system, previously assembled in a serial way (manual), but solved using PETSc in parallel.</div><div> Therefore I have the old assembled matrix to compare with the one assembled with PETSc.</div><div><br data-mce-bogus="1"></div><div>While doing the assembling of the matrix, I avoid the zero entries using the option 'MAT_IGNORE_ZERO_ENTRIES' in MatSetOption, however the final matrix has zero values (or almost) due to the addition of non zero elements.<br></div><div><div>Below the example of added values:</div><div><br></div><div>1664 i 1663 j -165509.423650377 <br> 1664 i 1663 j 165509.423650377 <br> 1664 i 1663 j -165509.423650377<br> 1664 i 1663 j 165509.423650377</div></div><div><br></div><div>Due to this difference between the two matrices I'm not able to get the solution for the matrix assembled with petsc.<br></div><div><div><br></div><div>Therefore I wonder if there is a way to remove zero entries from an assembled matrix, or which solver to use so that zeros will not be a problem.<br></div><div><br></div><div>Thanks in advance, <br data-mce-bogus="1"></div><div>Catherine<br data-mce-bogus="1"></div><div><br></div><div><br></div><div><br></div><div><br></div></div></div></div></body></html>