Advanced Service Routine Data Types
The Advanced Service routines refer to a structure
defining the properties of the basic generator.
This structure is
described
as follows:
typedef struct _VSLBRngProperties { int StreamStateSize; int NSeeds; int IncludesZero; int WordSize; int NBits; InitStreamPtr InitStream; sBRngPtr sBRng; dBRngPtr dBRng; iBRngPtr iBRng; } VSLBRngProperties;
The following table provides brief descriptions of
the fields engaged in the above structure:
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 ).
|
InitStream | Contains the pointer to the initialization
routine of a given basic generator.
|
sBRng | Contains the pointer to the basic generator of
single precision real numbers uniformly distributed over the interval ( a,b ) (float ).
|
dBRng | Contains the pointer to the basic generator of
double precision real numbers uniformly distributed over the interval ( a,b ) (double ).
|
iBRng | Contains the pointer to the basic generator of
integer numbers with uniform bit distribution
( unsigned int ).
|