ATAN Inverse Trigonometric Arctangent Function

Section: Mathematical Functions

Usage

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

where x is an n-dimensional array of numerical type. Integer types are promoted to the double type prior to calculation of the atan 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 atan function is defined for all arguments x as

For real valued variables x, the function is computed directly using the standard C library's numerical atan function. For both real and complex arguments x, note that generally

due to the periodicity of tan(x).

Example

The following code demonstates the atan function over the range [-1,1]. 
--> t = linspace(-1,1);
--> plot(t,atan(t))