(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
) : float
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 |
par1
The first parameter
par2
The second parameter
which
The flag to determine what to be calculated
Returns CDF, x, or lambda, determined by which
.