Actual source code: sprng.c
petsc-3.7.1 2016-05-15
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      2: #include <../src/sys/classes/random/randomimpl.h>

      4: #define USE_MPI
      5: #define SIMPLE_SPRNG
      6: EXTERN_C_BEGIN
      7: #include <sprng.h>
      8: EXTERN_C_END

     12: PetscErrorCode  PetscRandomSeed_Sprng(PetscRandom r)
     13: {
     15:   init_sprng(r->seed,SPRNG_DEFAULT);
     16:   return(0);
     17: }

     21: PetscErrorCode  PetscRandomGetValue_Sprng(PetscRandom r,PetscScalar *val)
     22: {
     24: #if defined(PETSC_USE_COMPLEX)
     25:   if (r->iset) {
     26:     *val = PetscRealPart(r->width)*sprng() + PetscRealPart(r->low) + (PetscImaginaryPart(r->width)*sprng() + PetscImaginaryPart(r->low)) * PETSC_i;
     27:   } else {
     28:     *val = sprng() + sprng()*PETSC_i;
     29:   }
     30: #else
     31:   if (r->iset) *val = r->width * sprng() + r->low;
     32:   else         *val = sprng();
     33: #endif
     34:   return(0);
     35: }

     39: PetscErrorCode  PetscRandomGetValueReal_Sprng(PetscRandom r,PetscScalar *val)
     40: {
     42: #if defined(PETSC_USE_COMPLEX)
     43:   if (r->iset) *val = PetscRealPart(r->width)*sprng() + PetscRealPart(r->low);
     44:   else         *val = sprng();
     45: #else
     46:   if (r->iset) *val = r->width * sprng() + r->low;
     47:   else         *val = sprng();
     48: #endif
     49:   return(0);
     50: }

     52: static struct _PetscRandomOps PetscRandomOps_Values = {
     53:   /* 0 */
     54:   PetscRandomSeed_Sprng,
     55:   PetscRandomGetValue_Sprng,
     56:   PetscRandomGetValueReal_Sprng,
     57:   0,
     58:   /* 5 */
     59:   0
     60: };

     62: /*MC
     63:    PETSCSPRNG- access to the publically available random number generator sprng

     65:    Options Database Keys:
     66: . -random_type <rand,rand48,sprng>

     68:   Level: beginner

     70:    PETSc must have been ./configure with the option --download-sprng to use
     71:    this random number generator.

     73:    This is NOT currently using a parallel random number generator. Sprng does have
     74:    an MPI version we should investigate.

     76: .seealso: RandomCreate(), RandomSetType(), PETSCRAND, PETSCRAND48
     77: M*/

     81: PETSC_EXTERN PetscErrorCode PetscRandomCreate_Sprng(PetscRandom r)
     82: {

     86:   PetscMemcpy(r->ops,&PetscRandomOps_Values,sizeof(PetscRandomOps_Values));
     87:   PetscObjectChangeTypeName((PetscObject)r,PETSCSPRNG);
     88:   return(0);
     89: }