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DRANDCAUCHY / SRANDCAUCHY
Generates a vector of random variates from a Cauchy distribution with probability density function, f(X), where: f(X) = 1 / [Pi * B * (1 + (X - A / B)^2)].
(Note that SRANDCAUCHY is the single precision version of DRANDCAUCHY. The argument lists of both routines are identical except that any double precision arguments of DRANDCAUCHY are replaced in SRANDCAUCHY by single precision arguments - type REAL in FORTRAN or type float in C).
— Input/Output: INTEGER STATE(*)
The STATE vector holds information on the state of the base generator being used and as such its minimum length varies. Prior to calling
DRANDCAUCHY
STATE must have been initialized. See Initialization of the Base Generators for information on initialization of the STATE variable.
On input: the current state of the base generator.
On output: the updated state of the base generator.
Example:
C Generate 100 values from the Cauchy distribution INTEGER LSTATE,N PARAMETER (LSTATE=16,N=100) INTEGER I,INFO,SEED(1),STATE(LSTATE) DOUBLE PRECISION A,B DOUBLE PRECISION X(N) C Set the seed SEED(1) = 1234 C Read in the distributional parameters READ(5,*) A,B C Initialize the STATE vector CALL DRANDINITIALIZE(1,1,SEED,1,STATE,LSTATE,INFO) C Generate N variates from the Cauchy distribution CALL DRANDCAUCHY(N,A,B,STATE,X,INFO) C Print the results WRITE(6,*) (X(I),I=1,N) |