PHP Manual
Statistic 函数
Probability density function of the Weibull distribution

stats_dens_weibull

(PECL stats >= 1.0.0)

stats_dens_weibull — Probability density function of the Weibull distribution

说明

stats_dens_weibull ( float $x , float $a , float $b ) : float

Returns the probability density at x, where the random variable follows the Weibull distribution of which the shape parameter is a and the scale parameter is b.

参数

x: The value at which the probability density is calculated
a: The shape parameter of the distribution
b: The scale parameter of the distribution

返回值

The probability density at x or FALSE for failure.

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