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DOUBLE PRECISION FUNCTION genexp(av)
C**********************************************************************
C
C DOUBLE PRECISION FUNCTION GENEXP( AV )
C
C GENerate EXPonential random deviate
C
C
C Function
C
C
C Generates a single random deviate from an exponential
C distribution with mean AV.
C
C
C Arguments
C
C
C AV --> The mean of the exponential distribution from which
C a random deviate is to be generated.
C DOUBLE PRECISION AV
C JJV (AV >= 0)
C
C GENEXP <-- The random deviate.
C DOUBLE PRECISION GENEXP
C
C
C Method
C
C
C Renames SEXPO from TOMS as slightly modified by BWB to use RANF
C instead of SUNIF.
C
C For details see:
C
C Ahrens, J.H. and Dieter, U.
C Computer Methods for Sampling From the
C Exponential and Normal Distributions.
C Comm. ACM, 15,10 (Oct. 1972), 873 - 882.
C
C**********************************************************************
C .. Scalar Arguments ..
DOUBLE PRECISION av
C ..
C .. External Functions ..
DOUBLE PRECISION sexpo
EXTERNAL sexpo
C ..
C .. Executable Statements ..
C JJV added check to ensure AV >= 0.0
10 genexp = sexpo()*av
RETURN
END
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