# Wblcdf

Wblcdf-func

## Definition:

computes the low tail Weibull cumulative distribution function for value using the parameters and .

The low tail Weibull cumulative distribution function is defined by:

where is the interval on which the Weibull CDF is not zero.

## Parameters:

- x (input, double)
- the value of the variate.
- a (input, double)
- the scale parameter, , of the required Weibull distribution, must be positive( ).
- b (input, double)
- the shape parameter, , of the required Weibull distribution, must be positive ( ) .
- prob (output, double)
- the probability.