1 #ifndef lint 2 static char vcid[] = "$Id: matio.c,v 1.9 1995/09/21 20:11:31 bsmith Exp bsmith $"; 3 #endif 4 5 /* 6 This file contains simple binary read/write routines for matrices. 7 */ 8 9 #include "petsc.h" 10 #include <unistd.h> 11 #include "vec/vecimpl.h" 12 #include "sysio.h" 13 #include "pinclude/pviewer.h" 14 #include "matimpl.h" 15 #include "row.h" 16 17 extern int MatLoad_MPIRowbs(Viewer,MatType,Mat *); 18 extern int MatLoad_SeqAIJ(Viewer,MatType,Mat *); 19 20 21 /* -------------------------------------------------------------------- */ 22 23 24 /* @ 25 MatLoad - Loads a matrix that has been stored in binary format 26 with MatView(). 27 28 Input Parameters: 29 . bview - Binary file viewer, created with ViewerFileOpenBinary() 30 . outtype - Type of matrix desired, for example MATSEQAIJ, MATMPIROWBS,.. 31 32 Output Parameters: 33 . newmat - new matrix 34 35 Notes: 36 In parallel, each processor can load a subset of rows (or the 37 entire matrix). This routine is especially useful when a large 38 matrix is stored on disk and only part of it is desired on each 39 processor. For example, a parallel solver may access only some of 40 the rows from each processor. The algorithm used here reads 41 relatively small blocks of data rather than reading the entire 42 matrix and then subsetting it. 43 44 Currently, the _entire_ matrix must be loaded. This should 45 probably change. 46 47 .seealso: MatView(), VecLoad() 48 */ 49 int MatLoad(Viewer bview,MatType outtype,Mat *newmat) 50 { 51 PetscObject vobj = (PetscObject) bview; 52 int ierr,set; 53 MatType type; 54 *newmat = 0; 55 56 PLogEventBegin(MAT_Load,bview,0,0,0); 57 ierr = MatGetFormatFromOptions(vobj->comm,&type,&set); CHKERRQ(ierr); 58 if (!set) type = outtype; 59 60 PETSCVALIDHEADERSPECIFIC(vobj,VIEWER_COOKIE); 61 if (vobj->type != BINARY_FILE_VIEWER) 62 SETERRQ(1,"MatLoad: Invalid viewer; open viewer with ViewerFileOpenBinary()"); 63 64 if (type == MATSEQAIJ) { 65 ierr = MatLoad_SeqAIJ(bview,type,newmat); CHKERRQ(ierr); 66 } 67 #if defined(HAVE_BLOCKSOLVE) && !defined(__cplusplus) 68 else if (type == MATMPIROWBS) { 69 ierr = MatLoad_MPIRowbs(bview,type,newmat); CHKERRQ(ierr); 70 } 71 #endif 72 else { 73 SETERRQ(1,"MatLoad: cannot load with that matrix type yet"); 74 } 75 76 PLogEventEnd(MAT_Load,bview,0,0,0); 77 return 0; 78 } 79