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

      6: PetscErrorCode  PetscRandomSeed_Rand(PetscRandom r)
      7: {
      9:   srand(r->seed);
     10:   return(0);
     11: }

     13: #define RAND_WRAP ((PetscReal)((rand()/(double)((unsigned int)RAND_MAX+1))))
     16: PetscErrorCode  PetscRandomGetValue_Rand(PetscRandom r,PetscScalar *val)
     17: {
     19: #if defined(PETSC_USE_COMPLEX)
     20:   if (r->iset) *val = PetscRealPart(r->width)*RAND_WRAP + PetscRealPart(r->low) + (PetscImaginaryPart(r->width)*RAND_WRAP + PetscImaginaryPart(r->low)) * PETSC_i;
     21:   else *val = RAND_WRAP + RAND_WRAP*PETSC_i;
     22: #else
     23:   if (r->iset) *val = r->width * RAND_WRAP + r->low;
     24:   else         *val = RAND_WRAP;
     25: #endif
     26:   return(0);
     27: }

     31: PetscErrorCode  PetscRandomGetValueReal_Rand(PetscRandom r,PetscReal *val)
     32: {
     34: #if defined(PETSC_USE_COMPLEX)
     35:     if (r->iset) *val = PetscRealPart(r->width)*RAND_WRAP + PetscRealPart(r->low);
     36:     else         *val = RAND_WRAP;
     37: #else
     38:   if (r->iset) *val = r->width * RAND_WRAP + r->low;
     39:   else         *val = RAND_WRAP;
     40: #endif
     41:   return(0);
     42: }

     44: static struct _PetscRandomOps PetscRandomOps_Values = {
     45:   /* 0 */
     46:   PetscRandomSeed_Rand,
     47:   PetscRandomGetValue_Rand,
     48:   PetscRandomGetValueReal_Rand,
     49:   0,
     50:   /* 5 */
     51:   0
     52: };

     54: /*MC
     55:    PETSCRAND - access to the basic Unix random number generator

     57:    Options Database Keys:
     58: . -random_type <rand,rand48,sprng>

     60:   Level: beginner

     62: .seealso: RandomCreate(), RandomSetType(), PETSCRAND48, PETSCSPRNG
     63: M*/

     67: PETSC_EXTERN PetscErrorCode PetscRandomCreate_Rand(PetscRandom r)
     68: {

     72:   PetscMemcpy(r->ops,&PetscRandomOps_Values,sizeof(PetscRandomOps_Values));
     73:   PetscObjectChangeTypeName((PetscObject)r,PETSCRAND);
     74:   return(0);
     75: }