1 static char help[] = "Tests 1D cell-based discretization tools.\n\n"; 2 3 #include <petscdt.h> 4 #include <petscviewer.h> 5 6 int main(int argc,char **argv) 7 { 8 PetscErrorCode ierr; 9 PetscInt i,j,degrees[1000],ndegrees,nsrc_points,ntarget_points; 10 PetscReal src_points[1000],target_points[1000],*R; 11 PetscBool flg; 12 13 PetscCall(PetscInitialize(&argc,&argv,(char*)0,help)); 14 ierr = PetscOptionsBegin(PETSC_COMM_WORLD,NULL,"Discretization tools test options",NULL);PetscCall(ierr); 15 { 16 ndegrees = 1000; 17 degrees[0] = 1; 18 degrees[1] = 2; 19 degrees[2] = 3; 20 PetscCall(PetscOptionsIntArray("-degrees","list of max degrees to evaluate","",degrees,&ndegrees,&flg)); 21 if (!flg) ndegrees = 3; 22 23 nsrc_points = 1000; 24 src_points[0] = -1.; 25 src_points[1] = 0.; 26 src_points[2] = 1.; 27 PetscCall(PetscOptionsRealArray("-src_points","list of points defining intervals on which to integrate","",src_points,&nsrc_points,&flg)); 28 if (!flg) nsrc_points = 3; 29 30 ntarget_points = 1000; 31 target_points[0] = -1.; 32 target_points[1] = 0.; 33 target_points[2] = 1.; 34 PetscCall(PetscOptionsRealArray("-target_points","list of points defining intervals on which to integrate","",target_points,&ntarget_points,&flg)); 35 if (!flg) ntarget_points = 3; 36 } 37 ierr = PetscOptionsEnd();PetscCall(ierr); 38 39 PetscCall(PetscMalloc1((nsrc_points-1)*(ntarget_points-1),&R)); 40 for (i=0; i<ndegrees; i++) { 41 PetscCall(PetscDTReconstructPoly(degrees[i],nsrc_points-1,src_points,ntarget_points-1,target_points,R)); 42 for (j=0; j<(ntarget_points-1)*(nsrc_points-1); j++) { /* Truncate to zero for nicer output */ 43 if (PetscAbs(R[j]) < 10*PETSC_MACHINE_EPSILON) R[j] = 0; 44 } 45 for (j=0; j<ntarget_points-1; j++) { 46 PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Degree %D target interval (%g,%g)\n",degrees[i],(double)target_points[j],(double)target_points[j+1])); 47 PetscCall(PetscRealView(nsrc_points-1,R+j*(nsrc_points-1),PETSC_VIEWER_STDOUT_WORLD)); 48 } 49 } 50 PetscCall(PetscFree(R)); 51 PetscCall(PetscFinalize()); 52 return 0; 53 } 54 55 /*TEST 56 test: 57 suffix: 1 58 args: -degrees 1,2,3 -target_points -0.3,0,.2 -src_points -1,-.3,0,.2,1 59 TEST*/ 60