PHP Manual
Statistic 函数
Probability density function of the exponential distribution

stats_dens_exponential

(PECL stats >= 1.0.0)

stats_dens_exponential — Probability density function of the exponential distribution

说明

stats_dens_exponential ( float $x , float $scale ) : float

Returns the probability density at x, where the random variable follows the exponential distribution of which the scale is scale.

参数

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

返回值

The probability density at x or FALSE for failure.

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