14a658b32SHong Zhang static char help[] ="Tests TS time span \n\n"; 24a658b32SHong Zhang 34a658b32SHong Zhang #include <petscts.h> 44a658b32SHong Zhang 54a658b32SHong Zhang static PetscErrorCode RHSFunction(TS ts,PetscReal t,Vec X,Vec F,void *ctx) 64a658b32SHong Zhang { 74a658b32SHong Zhang PetscInt i,n; 84a658b32SHong Zhang const PetscScalar *xx; 9e1db57b0SHong Zhang PetscScalar *ff; 104a658b32SHong Zhang 114a658b32SHong Zhang PetscFunctionBegin; 124a658b32SHong Zhang PetscCall(VecGetLocalSize(X,&n)); 134a658b32SHong Zhang PetscCall(VecGetArrayRead(X,&xx)); 144a658b32SHong Zhang PetscCall(VecGetArray(F,&ff)); 154a658b32SHong Zhang if (n >= 1) ff[0] = 1; 164a658b32SHong Zhang for (i = 1; i < n; i++) ff[i] = (i+1)*(xx[i-1]+PetscPowReal(t,i))/2; 174a658b32SHong Zhang PetscCall(VecRestoreArrayRead(X,&xx)); 184a658b32SHong Zhang PetscCall(VecRestoreArray(F,&ff)); 194a658b32SHong Zhang PetscFunctionReturn(0); 204a658b32SHong Zhang } 214a658b32SHong Zhang 224a658b32SHong Zhang int main(int argc, char *argv[]) 234a658b32SHong Zhang { 244a658b32SHong Zhang TS ts; 254a658b32SHong Zhang Vec X,*Xs; 264a658b32SHong Zhang PetscInt i,n,N = 9; 27e1db57b0SHong Zhang PetscReal tspan[8] = {16.0, 16.1, 16.2, 16.3, 16.4, 16.5, 16.6, 16.7}; 284a658b32SHong Zhang const PetscReal *tspan2; 294a658b32SHong Zhang 30*327415f7SBarry Smith PetscFunctionBeginUser; 314a658b32SHong Zhang PetscCall(PetscInitialize(&argc,&argv,NULL,help)); 324a658b32SHong Zhang PetscCall(TSCreate(PETSC_COMM_SELF,&ts)); 334a658b32SHong Zhang PetscCall(TSSetType(ts,TSRK)); 344a658b32SHong Zhang PetscCall(TSSetRHSFunction(ts,NULL,RHSFunction,NULL)); 354a658b32SHong Zhang PetscCall(VecCreateSeq(PETSC_COMM_SELF,N,&X)); 364a658b32SHong Zhang PetscCall(VecZeroEntries(X)); 37e1db57b0SHong Zhang PetscCall(TSSetTimeStep(ts,0.001)); 38e1db57b0SHong Zhang PetscCall(TSSetTimeSpan(ts,8,tspan)); 394a658b32SHong Zhang PetscCall(TSSetExactFinalTime(ts,TS_EXACTFINALTIME_MATCHSTEP)); 404a658b32SHong Zhang PetscCall(TSSetFromOptions(ts)); 414a658b32SHong Zhang PetscCall(TSSolve(ts,X)); 424a658b32SHong Zhang PetscCall(TSGetTimeSpanSolutions(ts,&n,&Xs)); 434a658b32SHong Zhang PetscCall(TSGetTimeSpan(ts,&n,&tspan2)); 444a658b32SHong Zhang PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Time Span: ")); 454a658b32SHong Zhang for (i=0; i<n; i++) PetscCall(PetscPrintf(PETSC_COMM_WORLD," %g",(double)tspan2[i])); 464a658b32SHong Zhang PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\n")); 474a658b32SHong Zhang PetscCall(TSDestroy(&ts)); 484a658b32SHong Zhang PetscCall(VecDestroy(&X)); 494a658b32SHong Zhang PetscCall(PetscFinalize()); 504a658b32SHong Zhang return 0; 514a658b32SHong Zhang } 524a658b32SHong Zhang 534a658b32SHong Zhang /*TEST 544a658b32SHong Zhang 554a658b32SHong Zhang testset: 564a658b32SHong Zhang test: 574a658b32SHong Zhang suffix: 1 584a658b32SHong Zhang args: -ts_monitor 594a658b32SHong Zhang test: 604a658b32SHong Zhang suffix: 2 61e1db57b0SHong Zhang requires: !single 62e1db57b0SHong Zhang args: -ts_monitor -ts_adapt_type none 634a658b32SHong Zhang TEST*/ 64