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.