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3.5.1.3.44 IncBeta
Description
This function is used to calculate the incomplete Beta function with parameters x, a, and b, which is denoted by:
/math-8f76e5248715f1cb224565f1214e6f21.png?v=0 "incbeta(x,a,b)=\frac{1}{B(a,b)}\int_{0}^{x} t^{a-1}(1-t)^{b-1}dt")
where B(a,b) is the Beta function.
Syntax
double incbeta(double x, double a, double b)
Parameters
x
- Input parameter. The value of the x variate, must lie on the interval [0, 1].
a
- Input parameter. The first shape parameter, a, of the required beta distribution, must be positive( a>0 ).
b
- Input parameter. The second shape parameter, b, of the required beta distribution, must be positive ( b>0 ).
Return
Returns the value of Beta function with parameters x, a and b.
Example
aa = incbeta(1,2,2); aa = ; //should return 1