16f79c3a4SBarry Smith #ifndef lint 2*9cf4f1e8SLois Curfman McInnes static char vcid[] = "$Id: axpy.c,v 1.9 1995/09/21 20:11:31 bsmith Exp curfman $"; 36f79c3a4SBarry Smith #endif 46f79c3a4SBarry Smith 548b35521SBarry Smith #include "matimpl.h" /*I "mat.h" I*/ 66f79c3a4SBarry Smith 706be10caSBarry Smith /*@ 8*9cf4f1e8SLois Curfman McInnes MatAXPY - Computes Y = a*X + Y 96f79c3a4SBarry Smith 106f79c3a4SBarry Smith Input Parameters: 1106be10caSBarry Smith . X,Y - the matrices 12*9cf4f1e8SLois Curfman McInnes . a - the scalar multiplier 136f79c3a4SBarry Smith 14*9cf4f1e8SLois Curfman McInnes .keywords: matrix, add 1506be10caSBarry Smith @*/ 1606be10caSBarry Smith int MatAXPY(Scalar *a,Mat X,Mat Y) 176f79c3a4SBarry Smith { 1806be10caSBarry Smith int m1,m2,n1,n2,i,*row,start,end,j,ncols,ierr; 1906be10caSBarry Smith Scalar *val,*vals; 206f79c3a4SBarry Smith 211a941147SBarry Smith PETSCVALIDHEADERSPECIFIC(X,MAT_COOKIE); PETSCVALIDHEADERSPECIFIC(Y,MAT_COOKIE); 2206be10caSBarry Smith MatGetSize(X,&m1,&n1); MatGetSize(X,&m2,&n2); 23bbb6d6a8SBarry Smith if (m1 != m2 || n1 != n2) SETERRQ(1,"MatAXPY:Non conforming matrix add"); 2478b31e54SBarry Smith vals = (Scalar *) PETSCMALLOC( n1*sizeof(Scalar) ); CHKPTRQ(vals); 2506be10caSBarry Smith MatGetOwnershipRange(X,&start,&end); 2606be10caSBarry Smith for ( i=start; i<end; i++ ) { 2706be10caSBarry Smith MatGetRow(X,i,&ncols,&row,&val); 2806be10caSBarry Smith for ( j=0; j<ncols; j++ ) { 2906be10caSBarry Smith vals[j] = (*a)*val[j]; 306f79c3a4SBarry Smith } 31dbb450caSBarry Smith ierr = MatSetValues(Y,1,&i,ncols,row,vals,ADD_VALUES); CHKERRQ(ierr); 3206be10caSBarry Smith MatRestoreRow(X,i,&ncols,&row,&val); 336f79c3a4SBarry Smith } 3478b31e54SBarry Smith PETSCFREE(vals); 3578b31e54SBarry Smith ierr = MatAssemblyBegin(Y,FINAL_ASSEMBLY); CHKERRQ(ierr); 3678b31e54SBarry Smith ierr = MatAssemblyEnd(Y,FINAL_ASSEMBLY); CHKERRQ(ierr); 376f79c3a4SBarry Smith return 0; 386f79c3a4SBarry Smith } 39