# sec, sech

## Purpose

Secant and hyperbolic secant.

## Synopsis

    Y = sec(X)
    Y = sech(X)

## Description

`sec` and `sech` operate element-wise on matrices. Their domains and ranges include complex values. All angles are in radians.

`sec(X)` is a matrix the same size as `X` containing the secant of the elements of `X`.

`sech(X)` is a matrix the same size as `X` containing the hyperbolic secant of the elements of `X`.

## Examples

`sec(pi/2) = 1.6332e+16` is not infinite, but rather a value the size of the reciprocal of the floating point accuracy `eps`, because `pi` is only a floating-point approximation to the exact value.

## Algorithm

## See Also

    asec, asech

(c) Copyright 1994 by The MathWorks, Inc.