COS Trigonometric Cosine Function

Section: Mathematical Functions

Usage

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

where x is an n-dimensional array of numerical type. Integer types are promoted to the double type prior to calculation of the cos 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 cos function is defined for all real valued arguments x by the infinite summation

For complex valued arguments z, the cosine is computed via

Example

The following piece of code plots the real-valued cos(2 pi x) function over one period of [0,1]: 
--> x = linspace(0,1);
--> plot(x,cos(2*pi*x))