betainc (MATLAB Functions)

MATLAB Function Reference

betainc

Incomplete beta function

Syntax

```
I = betainc(X,Z,W)
```

Definition

The incomplete beta function is

where , the beta function, is defined as

and is the gamma function.

Description

I = betainc(X,Z,W) computes the incomplete beta function for corresponding elements of the arrays X, Z and W. The elements of X must be in the closed interval . The arrays Z and W must be nonnegative and real. All arrays must be the same size, or any of them can be scalar.

Examples

format long 
betainc(.5,(0:10)',3)

ans =
   1.00000000000000
   0.87500000000000
   0.68750000000000
   0.50000000000000
   0.34375000000000
   0.22656250000000
   0.14453125000000
   0.08984375000000
   0.05468750000000
   0.03271484375000
   0.01928710937500

See Also

beta, betaln

beta betaln