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-rw-r--r--libm/double/pdtr.c184
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diff --git a/libm/double/pdtr.c b/libm/double/pdtr.c
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--- a/libm/double/pdtr.c
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-/* pdtr.c
- *
- * Poisson distribution
- *
- *
- *
- * SYNOPSIS:
- *
- * int k;
- * double m, y, pdtr();
- *
- * y = pdtr( 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().
- *
- */
- /* pdtrc()
- *
- * Complemented poisson distribution
- *
- *
- *
- * SYNOPSIS:
- *
- * int k;
- * double m, y, pdtrc();
- *
- * y = pdtrc( 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.
- *
- */
- /* pdtri()
- *
- * Inverse Poisson distribution
- *
- *
- *
- * SYNOPSIS:
- *
- * int k;
- * double m, y, pdtr();
- *
- * m = pdtri( 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 2.8: June, 2000
-Copyright 1984, 1987, 1995, 2000 by Stephen L. Moshier
-*/
-
-#include <math.h>
-#ifdef ANSIPROT
-extern double igam ( double, double );
-extern double igamc ( double, double );
-extern double igami ( double, double );
-#else
-double igam(), igamc(), igami();
-#endif
-
-double pdtrc( k, m )
-int k;
-double m;
-{
-double v;
-
-if( (k < 0) || (m <= 0.0) )
- {
- mtherr( "pdtrc", DOMAIN );
- return( 0.0 );
- }
-v = k+1;
-return( igam( v, m ) );
-}
-
-
-
-double pdtr( k, m )
-int k;
-double m;
-{
-double v;
-
-if( (k < 0) || (m <= 0.0) )
- {
- mtherr( "pdtr", DOMAIN );
- return( 0.0 );
- }
-v = k+1;
-return( igamc( v, m ) );
-}
-
-
-double pdtri( k, y )
-int k;
-double y;
-{
-double v;
-
-if( (k < 0) || (y < 0.0) || (y >= 1.0) )
- {
- mtherr( "pdtri", DOMAIN );
- return( 0.0 );
- }
-v = k+1;
-v = igami( v, y );
-return( v );
-}