Actual source code: rand.c

  1: #define PETSC_DLL

 3:  #include ../src/sys/random/randomimpl.h
  4: #if defined (PETSC_HAVE_STDLIB_H)
  5: #include <stdlib.h>
  6: #endif

 10: PetscErrorCode  PetscRandomSeed_Rand(PetscRandom r)
 11: {
 13:   srand(r->seed);
 14:   return(0);
 15: }

 17: #define RAND_WRAP ((PetscReal)((rand()/(double)((unsigned int)RAND_MAX+1))))
 20: PetscErrorCode  PetscRandomGetValue_Rand(PetscRandom r,PetscScalar *val)
 21: {
 23: #if defined(PETSC_USE_COMPLEX)
 24:   if (r->iset)
 25:     *val = PetscRealPart(r->width)*RAND_WRAP + PetscRealPart(r->low) +
 26:       (PetscImaginaryPart(r->width)*RAND_WRAP + PetscImaginaryPart(r->low)) * PETSC_i;
 27:   else *val = RAND_WRAP + RAND_WRAP*PETSC_i;
 28: #else
 29:   if (r->iset) *val = r->width * RAND_WRAP + r->low;
 30:   else         *val = RAND_WRAP;
 31: #endif
 32:   return(0);
 33: }

 37: PetscErrorCode  PetscRandomGetValueReal_Rand(PetscRandom r,PetscReal *val)
 38: {
 40: #if defined(PETSC_USE_COMPLEX)
 41:     if (r->iset) *val = PetscRealPart(r->width)*RAND_WRAP + PetscRealPart(r->low);
 42:     else         *val = RAND_WRAP;
 43: #else
 44:   if (r->iset) *val = r->width * RAND_WRAP + r->low;
 45:   else         *val = RAND_WRAP;
 46: #endif
 47:   return(0);
 48: }

 50: static struct _PetscRandomOps PetscRandomOps_Values = {
 51:   /* 0 */
 52:   PetscRandomSeed_Rand,
 53:   PetscRandomGetValue_Rand,
 54:   PetscRandomGetValueReal_Rand,
 55:    0,
 56:   /* 5 */
 57:   0
 58: };

 60: /*MC
 61:    PETSCRAND - access to the basic Unix random number generator

 63:    Options Database Keys:
 64: . -random_type <rand,rand48,sprng> 

 66:   Level: beginner

 68: .seealso: RandomCreate(), RandomSetType(), PETSCRAND48, PETSCSPRNG
 69: M*/

 74: PetscErrorCode  PetscRandomCreate_Rand(PetscRandom r)
 75: {

 79:   PetscMemcpy(r->ops,&PetscRandomOps_Values,sizeof(PetscRandomOps_Values));
 80:   PetscObjectChangeTypeName((PetscObject)r,PETSCRAND);
 81:   PetscPublishAll(r);
 82:   return(0);
 83: }