# stats_cdf_weibull

(PECL stats >= 1.0.0)

stats_cdf_weibull — Calculates any one parameter of the Weibull distribution given values for the others

### 说明

stats_cdf_weibull ( float `$par1` , float `$par2` , float `$par3` , int `$which` ) : float

Returns the cumulative distribution function, its inverse, or one of its parameters, of the binomial distribution. The kind of the return value and parameters (`par1`, `par2`, and `par3`) are determined by `which`.

The following table lists the return value and parameters by `which`. CDF, x, k, and lambda denotes cumurative distribution function, the value of the random variable, the shape and the scale parameter of the Weibull distribution, respectively.

Return value and parameters
`which` | Return value | `par1` | `par2` | `par3`
--- | --- | --- | --- | ---
1 | CDF | x | k | lambda
2 | x | CDF | k | lambda
3 | k | x | CDF | lambda
4 | lambda | x | CDF | k

### 参数

`par1`

  The first parameter

`par2`

  The second parameter

`par3`

  The third parameter

`which`

  The flag to determine what to be calculated

### 返回值

Returns CDF, x, k, or lambda, determined by `which`.