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Section: Mathematical Functions
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). 
Mathematically, the exp function is defined for all real valued arguments x as 
![\[ \exp x \equiv e^{x}, \]](form_71.png) 
where
![\[ e = \sum_{0}^{\infty} \frac{1}{k!} \]](form_72.png) 
 and is approximately 2.718281828459045 (returned by the function e). For complex values z, the famous Euler formula is used to calculate the exponential 
![\[ e^{z} = e^{|z|} \left[ \cos \Re z + i \sin \Re z \right] \]](form_73.png) 
The following piece of code plots the real-valued exp function over the interval [-1,1]:
--> x = linspace(-1,1); --> plot(x,exp(x))
 
e^{i 2 pi x} for x in [-1,1].
--> x = linspace(-1,1); --> plot(exp(-i*x*2*pi))
