Developer Reference

  • 2020.2
  • 07/15/2020
  • Public Content
Contents

Advanced Service Routine Data Types

The Advanced Service routines refer to a structure defining the properties of the basic generator.
This structure is described in Fortran 90 as follows:
TYPE VSL_BRNG_PROPERTIES INTEGER streamstatesize INTEGER nseeds INTEGER includeszero INTEGER wordsize INTEGER nbits INTEGER reserved(8) END TYPE VSL_BRNG_PROPERTIES
The following table provides brief descriptions of the fields engaged in the above structure:
Field Descriptions
Field
Short Description
streamstatesize
The size, in bytes, of the stream state structure for a given basic generator.
nseeds
The number of 32-bit initial conditions (seeds) necessary to initialize the stream state structure for a given basic generator.
includeszero
Flag value indicating whether the generator can produce a random 0.
wordsize
Machine word size, in bytes, used in integer-value computations. Possible values: 4, 8, and 16 for 32, 64, and 128-bit generators, respectively.
nbits
The number of bits required to represent a random value in integer arithmetic. Note that, for instance, 48-bit random values are stored to 64-bit (8 byte) memory locations. In this case,
wordsize
/
WordSize
is equal to
8
(number of bytes used to store the random value), while
nbits
/
NBits
contains the actual number of bits occupied by the value (in this example,
48
).
reserved(8)
Reserved for internal use.
Using Advanced Service routines for defining generators is not supported for Fortran, but you can use the Fortran interface to get information about a previously-registered generator using
vslGetBrngProperties
.

Product and Performance Information

1

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