EXP Exponential Function

Section: Mathematical Functions

Usage

Computes the exp function for its argument. The general syntax for its use is 
   y = exp(x)

where x is an n-dimensional array of numerical type. Integer types are promoted to the double type prior to calculation of the exp function. Output y is of the same size and type as the input x, (unless x is an integer, in which case y is a double type).

Function Internals

Mathematically, the exp function is defined for all real valued arguments x as

where

and is approximately 2.718281828459045 (returned by the function e). For complex values z, the famous Euler formula is used to calculate the exponential

Example

The following piece of code plots the real-valued exp function over the interval [-1,1]: 
--> x = linspace(-1,1);
--> plot(x,exp(x))

In the second example, we plot the unit circle in the complex plane e^{i 2 pi x} for x in [-1,1]. 

--> x = linspace(-1,1);
--> plot(exp(-i*x*2*pi))