103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
/*BHEADER**********************************************************************
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* (c) 1997 The Regents of the University of California
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*
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* See the file COPYRIGHT_and_DISCLAIMER for a complete copyright
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* notice, contact person, and disclaimer.
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*
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* $Revision$
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*********************************************************************EHEADER*/
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/******************************************************************************
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*
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* Routine for building a DistributedMatrix from a ParCSRMatrix
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*
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*****************************************************************************/
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#ifdef HYPRE_DEBUG
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#include <gmalloc.h>
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#endif
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#include <HYPRE_config.h>
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#include "general.h"
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#include "HYPRE.h"
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#include "HYPRE_utilities.h"
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/* Prototypes for DistributedMatrix */
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#include "HYPRE_distributed_matrix_types.h"
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#include "HYPRE_distributed_matrix_protos.h"
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/* Matrix prototypes for IJMatirx */
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#include "IJ_mv/HYPRE_IJ_mv.h"
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/*--------------------------------------------------------------------------
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* HYPRE_BuildIJMatrixFromDistributedMatrix
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*--------------------------------------------------------------------------*/
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/**
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Builds an IJMatrix from a distributed matrix by pulling rows out of the
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distributed_matrix and putting them into the IJMatrix. This routine does not
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effect the distributed matrix. In essence, it makes a copy of the input matrix
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in another format. NOTE: because this routine makes a copy and is not just
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a simple conversion, it is memory-expensive and should only be used in
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low-memory requirement situations (such as unit-testing code).
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*/
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int
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HYPRE_BuildIJMatrixFromDistributedMatrix(
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HYPRE_DistributedMatrix DistributedMatrix,
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HYPRE_IJMatrix *ij_matrix,
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int local_storage_type )
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{
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int ierr;
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MPI_Comm comm;
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int M, N;
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int first_local_row, last_local_row;
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int first_local_col, last_local_col;
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int i;
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int size, *col_ind;
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double *values;
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if (!DistributedMatrix) return(-1);
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comm = HYPRE_DistributedMatrixGetContext( DistributedMatrix );
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ierr = HYPRE_DistributedMatrixGetDims( DistributedMatrix, &M, &N );
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ierr = HYPRE_NewIJMatrix( comm, ij_matrix, M, N );
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ierr = HYPRE_SetIJMatrixLocalStorageType(
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*ij_matrix, local_storage_type );
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if(ierr) return(ierr);
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ierr = HYPRE_DistributedMatrixGetLocalRange( DistributedMatrix,
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&first_local_row, &last_local_row ,
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&first_local_col, &last_local_col );
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ierr = HYPRE_SetIJMatrixLocalSize( *ij_matrix,
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last_local_row-first_local_row+1,
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last_local_col-first_local_col+1 );
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ierr = HYPRE_InitializeIJMatrix( *ij_matrix );
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if(ierr) return(ierr);
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/* Loop through all locally stored rows and insert them into ij_matrix */
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for (i=first_local_row; i<= last_local_row; i++)
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{
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ierr = HYPRE_DistributedMatrixGetRow( DistributedMatrix, i, &size, &col_ind, &values );
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if( ierr ) return(ierr);
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ierr = HYPRE_InsertIJMatrixRow( *ij_matrix, size, i, col_ind, values );
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if( ierr ) return(ierr);
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ierr = HYPRE_DistributedMatrixRestoreRow( DistributedMatrix, i, &size, &col_ind, &values );
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if( ierr ) return(ierr);
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}
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ierr = HYPRE_AssembleIJMatrix( *ij_matrix );
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if(ierr) return(ierr);
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return(ierr);
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}
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