e3181f26b1
Changed MPI routines to hypre_MPI routines. Added hypre_printf, etc. routines. Added AUTOTEST tests to look for 'int' and 'MPI_' calls. Added a new approach for the Fortran interface (not implemented everywhere yet).
119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
/*BHEADER**********************************************************************
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* Copyright (c) 2008, Lawrence Livermore National Security, LLC.
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* Produced at the Lawrence Livermore National Laboratory.
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* This file is part of HYPRE. See file COPYRIGHT for details.
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*
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* HYPRE is free software; you can redistribute it and/or modify it under the
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* terms of the GNU Lesser General Public License (as published by the Free
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* Software Foundation) version 2.1 dated February 1999.
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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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* This is an example of a C code illustrating the indentation used
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* for Hypre. This code does not illustrate issues related to
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* documentation, error handling, efficiency of implementation or
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* naming conventions.
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*
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* The most important item here is consistent indentation of the following
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* structures:
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* - for loops
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* - if statements
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*
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* Note that this code does something nonsensical - it is mainly for the
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* illustration of indentation.
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*
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*****************************************************************************/
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#include "headers.h"
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/*--------------------------------------------------------------------------
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* Matvec - matrix-vector function.
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*
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* Calculates y = alpha * A * x + beta * y
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* where A is a matrix stored in compressed sparse row format, x and y
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* are n vectors, and alpha and beta are scalars.
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*
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*--------------------------------------------------------------------------*/
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void
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Matvec( double alpha,
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Matrix *A,
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Vector *x,
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double beta,
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Vector *y )
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{
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double *a = MatrixData(A); /* element values for matrix A */
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HYPRE_Int *ia = MatrixIA(A); /* pointer to start of each row */
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HYPRE_Int *ja = MatrixJA(A); /* column values for matrix elements */
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HYPRE_Int n = MatrixSize(A); /* size of matrix */
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double *xp = VectorData(x);
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double *yp = VectorData(y);
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double temp;
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HYPRE_Int i, j, jj;
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/*-----------------------------------------------------------------------
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* Do (alpha == 0.0) computation
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*-----------------------------------------------------------------------*/
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if (alpha == 0.0)
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{
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for (i = 0; i < n; i++)
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yp[i] *= beta;
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return;
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}
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/*-----------------------------------------------------------------------
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* y = (beta/alpha)*y
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*-----------------------------------------------------------------------*/
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temp = beta / alpha;
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if (temp != 1.0)
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{
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if (temp == 0.0)
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{
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for (i = 0; i < n; i++)
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yp[i] = 0.0;
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}
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else
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{
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for (i = 0; i < n; i++)
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yp[i] *= temp;
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}
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}
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/*-----------------------------------------------------------------
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* y += A*x
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*-----------------------------------------------------------------*/
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for (i = 0; i < n; i++)
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{
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for (jj = ia[i]-1; jj < ia[i+1]-1; jj++)
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{
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j = ja[jj]-1;
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yp[i] += a[jj] * xp[j];
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}
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}
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/*-----------------------------------------------------------------
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* y = alpha*y
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*-----------------------------------------------------------------*/
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if (alpha != 1.0)
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{
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for (i = 0; i < n; i++)
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yp[i] *= alpha;
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}
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}
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