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 ).
|