# Difference between revisions of "Exponential Command" ##### Command Categories (All commands)

Exponential[ <Mean λ>, x ]
Creates probability density function (pdf) of exponential distribution with mean λ.
Exponential[ <Mean λ>, x, <Boolean Cumulative> ]
If Cumulative is true, creates cumulative distribution function (cdf) of exponential distribution, otherwise creates pdf of Exponential distribution.
Exponential[ <Mean λ>, <Variable Value v> ]
Calculates the value of cumulative distribution function of Exponential distribution at v, i.e. the probability P(X≤v) where X is a random variable with Exponential distribution with mean λ.
Note: Returns the probability for a given x-coordinate's value (or area under the Exponential distribution curve to the left of the given x-coordinate).

## CAS Syntax

In CAS View only following syntax is supported:

Exponential[ <Mean λ>, <Variable Value v>]
Calculates the value of cumulative distribution function of exponential distribution at v, i.e. the probability P(X≤v) where X is a random variable with Exponential distribution with mean λ.
Example:
Exponential[4, 3] gives \frac{d12-1}{e12}, the sum of all positive divisors of 15, including 15.
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