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IMSL_BETAI

IMSL_BETAI

The IMSL_BETAI function evaluates the real incomplete beta function.



Syntax


Result = IMSL_BETAI(x, a, b [, /DOUBLE])

Return Value


The value of the incomplete beta function.

Arguments


x

Upper limit of integration.

a

First beta distribution parameter.

b

Second beta distribution parameter.

Keywords


DOUBLE

If present and nonzero, double precision is used.

Discussion


The incomplete beta function is defined as:

requiring that 0 £ x £ 1, a > 0, and b > 0. It underflows for sufficiently small x and large a. This underflow is not reported as an error. Instead, the value zero is returned.

Example


In this example, I0.61(2.2, 3.7) is computed and printed.

PM, IMSL_BETAI(.61, 2.2, 3.7)  
0.882172

Version History


6.4
Introduced



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