# Category : C Source Code

Archive : CEPHES22.ZIP

Filename : BTDTR.C

/* btdtr.c

*

* Beta distribution

*

*

*

* SYNOPSIS:

*

* double a, b, x, y, btdtr();

*

* y = btdtr( a, b, x );

*

*

*

* DESCRIPTION:

*

* Returns the area from zero to x under the beta density

* function:

*

*

* x

* - -

* | (a+b) | | a-1 b-1

* P(x) = ---------- | t (1-t) dt

* - - | |

* | (a) | (b) -

* 0

*

*

* This function is identical to the incomplete beta

* integral function incbet(a, b, x).

*

* The complemented function is

*

* 1 - P(1-x) = incbet( b, a, x );

*

*

* ACCURACY:

*

* See incbet.c.

*

*/

/* btdtr() */

/*

Cephes Math Library Release 2.0: April, 1987

Copyright 1984, 1987 by Stephen L. Moshier

Direct inquiries to 30 Frost Street, Cambridge, MA 02140

*/

double btdtr( a, b, x )

double a, b, x;

{

double incbet();

return( incbet( a, b, x ) );

}

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