| FreeMat
    | 
Section: Mathematical Functions
Computes the sec function for its argument. The general syntax for its use is 
y = sec(x)
 where x is an n-dimensional array of numerical type. Integer types are promoted to the double type prior to calculation of the sec 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 sec function is defined for all arguments as 
![\[ \sec x \equiv \frac{1}{\cos x}. \]](form_78.png) 
The following piece of code plots the real-valued sec(2 pi x) function over the interval of [-1,1]:
--> t = linspace(-1,1,1000); --> plot(t,sec(2*pi*t)) --> axis([-1,1,-10,10]);
