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 *    #include <Rmath.h>
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 *    #include <Rmath.h>
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 *    double lbeta(double a, double b);
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 *    double lbeta(double a, double b);
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 *
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 *
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 *  DESCRIPTION
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 *  DESCRIPTION
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 *
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 *
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 *    This function returns the value of the log beta function.
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 *    This function returns the value of the log beta function
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 *
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 *	log B(a,b) = log G(a) + log G(b) - log G(a+b)
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 *
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 *
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 *  NOTES
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 *  NOTES
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 *
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 *
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 *    This routine is a translation into C of a Fortran subroutine
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 *    This routine is a translation into C of a Fortran subroutine
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 *    by W. Fullerton of Los Alamos Scientific Laboratory.
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 *    by W. Fullerton of Los Alamos Scientific Laboratory.