1 #ifdef PETSC_RCS_HEADER 2 static char vcid[] = "$Id: snesj2.c,v 1.9 1997/09/25 22:40:16 curfman Exp curfman $"; 3 #endif 4 5 #include "src/mat/matimpl.h" /*I "mat.h" I*/ 6 #include "src/snes/snesimpl.h" /*I "snes.h" I*/ 7 8 #undef __FUNC__ 9 #define __FUNC__ "SNESDefaultComputeJacobianWithColoring" 10 /*@C 11 SNESDefaultComputeJacobianWithColoring - Computes the Jacobian using 12 finite differences and coloring to exploit matrix sparsity. 13 14 Input Parameters: 15 . snes - nonlinear solver object 16 . x1 - location at which to evaluate Jacobian 17 . ctx - coloring context, where 18 $ ctx must have type MatFDColoring, 19 $ as created via MatFDColoringCreate() 20 21 Output Parameters: 22 . J - Jacobian matrix (not altered in this routine) 23 . B - newly computed Jacobian matrix to use with preconditioner (generally the same as J) 24 . flag - flag indicating whether the matrix sparsity structure has changed 25 26 .keywords: SNES, finite differences, Jacobian, coloring, sparse 27 28 .seealso: SNESSetJacobian(), SNESTestJacobian(), SNESDefaultComputeJacobian() 29 @*/ 30 int SNESDefaultComputeJacobianWithColoring(SNES snes,Vec x1,Mat *J,Mat *B,MatStructure *flag,void *ctx) 31 { 32 MatFDColoring color = (MatFDColoring) ctx; 33 int ierr; 34 35 ierr = MatFDColoringApply(*B,color,x1,flag,snes); CHKERRQ(ierr); 36 return 0; 37 } 38 39 40 41