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-rw-r--r--libm/ldouble/pdtrl.c184
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diff --git a/libm/ldouble/pdtrl.c b/libm/ldouble/pdtrl.c
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-/* pdtrl.c
- *
- * Poisson distribution
- *
- *
- *
- * SYNOPSIS:
- *
- * int k;
- * long double m, y, pdtrl();
- *
- * y = pdtrl( k, m );
- *
- *
- *
- * DESCRIPTION:
- *
- * Returns the sum of the first k terms of the Poisson
- * distribution:
- *
- * k j
- * -- -m m
- * > e --
- * -- j!
- * j=0
- *
- * The terms are not summed directly; instead the incomplete
- * gamma integral is employed, according to the relation
- *
- * y = pdtr( k, m ) = igamc( k+1, m ).
- *
- * The arguments must both be positive.
- *
- *
- *
- * ACCURACY:
- *
- * See igamc().
- *
- */
- /* pdtrcl()
- *
- * Complemented poisson distribution
- *
- *
- *
- * SYNOPSIS:
- *
- * int k;
- * long double m, y, pdtrcl();
- *
- * y = pdtrcl( k, m );
- *
- *
- *
- * DESCRIPTION:
- *
- * Returns the sum of the terms k+1 to infinity of the Poisson
- * distribution:
- *
- * inf. j
- * -- -m m
- * > e --
- * -- j!
- * j=k+1
- *
- * The terms are not summed directly; instead the incomplete
- * gamma integral is employed, according to the formula
- *
- * y = pdtrc( k, m ) = igam( k+1, m ).
- *
- * The arguments must both be positive.
- *
- *
- *
- * ACCURACY:
- *
- * See igam.c.
- *
- */
- /* pdtril()
- *
- * Inverse Poisson distribution
- *
- *
- *
- * SYNOPSIS:
- *
- * int k;
- * long double m, y, pdtrl();
- *
- * m = pdtril( k, y );
- *
- *
- *
- *
- * DESCRIPTION:
- *
- * Finds the Poisson variable x such that the integral
- * from 0 to x of the Poisson density is equal to the
- * given probability y.
- *
- * This is accomplished using the inverse gamma integral
- * function and the relation
- *
- * m = igami( k+1, y ).
- *
- *
- *
- *
- * ACCURACY:
- *
- * See igami.c.
- *
- * ERROR MESSAGES:
- *
- * message condition value returned
- * pdtri domain y < 0 or y >= 1 0.0
- * k < 0
- *
- */
-
-/*
-Cephes Math Library Release 2.3: March, 1995
-Copyright 1984, 1995 by Stephen L. Moshier
-*/
-
-#include <math.h>
-#ifdef ANSIPROT
-extern long double igaml ( long double, long double );
-extern long double igamcl ( long double, long double );
-extern long double igamil ( long double, long double );
-#else
-long double igaml(), igamcl(), igamil();
-#endif
-
-long double pdtrcl( k, m )
-int k;
-long double m;
-{
-long double v;
-
-if( (k < 0) || (m <= 0.0L) )
- {
- mtherr( "pdtrcl", DOMAIN );
- return( 0.0L );
- }
-v = k+1;
-return( igaml( v, m ) );
-}
-
-
-
-long double pdtrl( k, m )
-int k;
-long double m;
-{
-long double v;
-
-if( (k < 0) || (m <= 0.0L) )
- {
- mtherr( "pdtrl", DOMAIN );
- return( 0.0L );
- }
-v = k+1;
-return( igamcl( v, m ) );
-}
-
-
-long double pdtril( k, y )
-int k;
-long double y;
-{
-long double v;
-
-if( (k < 0) || (y < 0.0L) || (y >= 1.0L) )
- {
- mtherr( "pdtril", DOMAIN );
- return( 0.0L );
- }
-v = k+1;
-v = igamil( v, y );
-return( v );
-}