Section: Mathematical Functions
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).  
sec function is defined for all arguments
as
 
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]);
