(PECL stats >= 1.0.0)
stats_cdf_exponential — Calculates any one parameter of the exponential distribution given values for the others.
$par1
, float $par2
, int $which
)
Returns the cumulative distribution function, its inverse, or one of its parameters,
of the exponential distribution. The kind of the return value and parameters
(par1 and par2) are determined by
which.
The following table lists the return value and parameters by which.
CDF, x, and lambda denotes cumurative distribution function, the value of the random
variable, and the rate parameter of the exponential distribution, respectively.
which |
Return value | par1 |
par2 |
|---|---|---|---|
| 1 | CDF | x | lambda |
| 2 | x | CDF | lambda |
| 3 | lambda | x | CDF |
par1The first parameter
par2The second parameter
whichThe flag to determine what to be calculated
Returns CDF, x, or lambda, determined by which.