<div dir="ltr"><br><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><br><div class="gmail_quote"><div>MPI_Comm comm;<br></div><div>PetscMPIInt rank;<br></div><div>char filename[PETSC_MAX_PATH_LEN];<br></div><div><br></div><div>ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr);<br></div><div>ierr = PetscSNPrintf(filename,PETSC_MAX_PATH_LEN-1,"u-%d.txt",rank);CHKERRQ(ierr);<br></div><div>ierr = PetscObjectGetComm(((PetscObject)u_local,&comm);CHKERRQ(ierr);<br></div><div>ierr = PetscViewerASCIIOpen(comm,filename,viewer);CHKERRQ(ierr);<br></div><span class=""></span></div></div></div></blockquote><div><br>The last line should be<br>ierr = PetscViewerASCIIOpen(comm,filename,<b>&viewer</b>);CHKERRQ(ierr);<br><br></div></div></div></div>