# Exponential Command

From GeoGebra Manual

- Exponential[ <Lambda>, x ]
- Creates probability density function (pdf) of exponential distribution with parameter
*lambda*. - Exponential[ <Lambda>, x, <Boolean Cumulative> ]
- If
*Cumulative*is true, creates cumulative distribution function (cdf) of exponential distribution, otherwise creates pdf of Exponential distribution. - Exponential[ <Lambda>, <Variable Value> ]
- Calculates the value of cumulative distribution function of Exponential distribution at variable value
*v*, i.e. the probability*P(X ≤ v)*where*X*is a random variable with Exponential distribution with parameter*lambda*. **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

- Exponential[ <Lambda>, <Variable Value> ]
- Calculates the value of cumulative distribution function of exponential distribution at variable value
*v*, i.e. the probability*P(X ≤ v)*where*X*is a random variable with Exponential distribution with parameter*lambda*. **Example:**`Exponential[2, 1]`

yields*\frac{e^{2} - 1}{e^{2} }*, which is approximately*0.86*.