PHP Manual
Statistic 函数
Probability density function of the gamma distribution

stats_dens_gamma

(PECL stats >= 1.0.0)

stats_dens_gamma — Probability density function of the gamma distribution

说明

stats_dens_gamma ( float $x , float $shape , float $scale ) : float

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

参数

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

返回值

The probability density at x or FALSE for failure.

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