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ASEC Inverse Secant Function

Section: Mathematical Functions

# Usage

Computes the inverse secant of its argument. The general syntax for its use is

      y = asec(x)

where `x` is an `n`-dimensional array of numerical type.

# Internals

The `acosh` function is computed from the formula

# Examples

Here is a simple plot of the inverse secant function

    --> x1 = -5:.01:-1;
    --> x2 = 1:.01:5;
    --> plot(x1,asec(x1),x2,asec(x2)); grid('on');