MATLAB Functions Help Desk

sec, sech

Purpose

Secant and hyperbolic secant

Syntax

Description

The sec and sech commands operate element-wise on arrays. The functions' domains and ranges include complex values. All angles are in radians.

Y = sec(X) returns an array the same size as X containing the secant of the elements of X.

Y = sech(X) returns an array the same size as X containing the hyperbolic secant of the elements of X.

Examples

Graph the secant over the domains

and

and the hyperbolic secant over the domain

The expression sec(pi/2) does not evaluate as infinite but as the reciprocal of the floating-point accuracy eps, because pi is a floating-point approximation to the exact value of .

Algorithm



See Also

asec, asech Inverse secant and inverse hyperbolic secant



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