BETA Function
Evaluates the complete beta function.
Usage
result = BETA(x, y)
Input Parameters
x—First beta parameter. x must be positive.
y—Second beta parameter. y must be positive.
Returned Value
result—The value of the beta function β(x, y). If no result can be computed, then NaN is returned.
Input Keywords
Double—If present and nonzero, double precision is used.
Discussion
The beta function, β(x, y), is defined to be:
The beta function requires that x > 0 and y > 0. It underflows for large arguments.
Example
Evaluate the beta function β(0.5, 0.2).
x = 0.5
y = 0.2
ans = BETA(x, y)
PRINT, 'beta(', x, ',', y, ') =', ans; PV-WAVE prints: beta( 0.500000, 0.200000) = 6.26865
Alert Errors
STAT_BETA_UNDERFLOW—The arguments must not be so large that the result underflows.
Fatal Errors
STAT_ZERO_ARG_OVERFLOW—One of the arguments is so close to zero that the result overflows.
