16f79c3a4SBarry Smith #ifndef lint 2*0452661fSBarry Smith static char vcid[] = "$Id: axpy.c,v 1.11 1995/10/11 15:20:06 bsmith Exp bsmith $"; 36f79c3a4SBarry Smith #endif 46f79c3a4SBarry Smith 548b35521SBarry Smith #include "matimpl.h" /*I "mat.h" I*/ 66f79c3a4SBarry Smith 706be10caSBarry Smith /*@ 89cf4f1e8SLois Curfman McInnes MatAXPY - Computes Y = a*X + Y 96f79c3a4SBarry Smith 106f79c3a4SBarry Smith Input Parameters: 1106be10caSBarry Smith . X,Y - the matrices 129cf4f1e8SLois Curfman McInnes . a - the scalar multiplier 136f79c3a4SBarry Smith 149cf4f1e8SLois 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"); 241987afe7SBarry Smith 251987afe7SBarry Smith if (X->ops.axpy) { 261987afe7SBarry Smith ierr = (*X->ops.axpy)(a,X,Y); CHKERRQ(ierr); 271987afe7SBarry Smith } 281987afe7SBarry Smith else { 29*0452661fSBarry Smith vals = (Scalar *) PetscMalloc( n1*sizeof(Scalar) ); CHKPTRQ(vals); 3006be10caSBarry Smith MatGetOwnershipRange(X,&start,&end); 3106be10caSBarry Smith for ( i=start; i<end; i++ ) { 3206be10caSBarry Smith MatGetRow(X,i,&ncols,&row,&val); 3306be10caSBarry Smith for ( j=0; j<ncols; j++ ) { 3406be10caSBarry Smith vals[j] = (*a)*val[j]; 356f79c3a4SBarry Smith } 36dbb450caSBarry Smith ierr = MatSetValues(Y,1,&i,ncols,row,vals,ADD_VALUES); CHKERRQ(ierr); 3706be10caSBarry Smith MatRestoreRow(X,i,&ncols,&row,&val); 386f79c3a4SBarry Smith } 39*0452661fSBarry Smith PetscFree(vals); 4078b31e54SBarry Smith ierr = MatAssemblyBegin(Y,FINAL_ASSEMBLY); CHKERRQ(ierr); 4178b31e54SBarry Smith ierr = MatAssemblyEnd(Y,FINAL_ASSEMBLY); CHKERRQ(ierr); 421987afe7SBarry Smith } 436f79c3a4SBarry Smith return 0; 446f79c3a4SBarry Smith } 45