1 2 #include <petsc/private/randomimpl.h> 3 4 #define USE_MPI 5 #define SIMPLE_SPRNG 6 EXTERN_C_BEGIN 7 #include <sprng.h> 8 EXTERN_C_END 9 10 PetscErrorCode PetscRandomSeed_Sprng(PetscRandom r) 11 { 12 PetscFunctionBegin; 13 init_sprng(r->seed,SPRNG_DEFAULT); 14 PetscFunctionReturn(0); 15 } 16 17 PetscErrorCode PetscRandomGetValue_Sprng(PetscRandom r,PetscScalar *val) 18 { 19 PetscFunctionBegin; 20 #if defined(PETSC_USE_COMPLEX) 21 if (r->iset) { 22 *val = PetscRealPart(r->width)*sprng() + PetscRealPart(r->low) + (PetscImaginaryPart(r->width)*sprng() + PetscImaginaryPart(r->low)) * PETSC_i; 23 } else { 24 *val = sprng() + sprng()*PETSC_i; 25 } 26 #else 27 if (r->iset) *val = r->width * sprng() + r->low; 28 else *val = sprng(); 29 #endif 30 PetscFunctionReturn(0); 31 } 32 33 PetscErrorCode PetscRandomGetValueReal_Sprng(PetscRandom r,PetscReal *val) 34 { 35 PetscFunctionBegin; 36 #if defined(PETSC_USE_COMPLEX) 37 if (r->iset) *val = PetscRealPart(r->width)*sprng() + PetscRealPart(r->low); 38 else *val = sprng(); 39 #else 40 if (r->iset) *val = r->width * sprng() + r->low; 41 else *val = sprng(); 42 #endif 43 PetscFunctionReturn(0); 44 } 45 46 static struct _PetscRandomOps PetscRandomOps_Values = { 47 PetscDesignatedInitializer(seed,PetscRandomSeed_Sprng), 48 PetscDesignatedInitializer(getvalue,PetscRandomGetValue_Sprng), 49 PetscDesignatedInitializer(getvaluereal,PetscRandomGetValueReal_Sprng), 50 }; 51 52 /*MC 53 PETSCSPRNG - access to the publically available random number generator sprng 54 55 Options Database Keys: 56 . -random_type <rand,rand48,sprng> 57 58 Level: beginner 59 60 PETSc must have been ./configure with the option --download-sprng to use 61 this random number generator. 62 63 This is NOT currently using a parallel random number generator. Sprng does have 64 an MPI version we should investigate. 65 66 .seealso: `RandomCreate()`, `RandomSetType()`, `PETSCRAND`, `PETSCRAND48` 67 M*/ 68 69 PETSC_EXTERN PetscErrorCode PetscRandomCreate_Sprng(PetscRandom r) 70 { 71 PetscFunctionBegin; 72 PetscCall(PetscMemcpy(r->ops,&PetscRandomOps_Values,sizeof(PetscRandomOps_Values))); 73 PetscCall(PetscObjectChangeTypeName((PetscObject)r,PETSCSPRNG)); 74 PetscFunctionReturn(0); 75 } 76