Scilab Home page | Wiki | Bug tracker | Forge | Mailing list archives | ATOMS | File exchange
Please login or create an account
Change language to: Français - Português - 日本語 - Русский

Please note that the recommended version of Scilab is 6.0.1. This page might be outdated.
See the recommended documentation of this function

Scilab help >> Elementary Functions > Trigonometry > asec

asec

computes the element-wise inverse secant of the argument.

Calling Sequence

y = asec(x)

Arguments

x

a real or complex array.

y

a real or complex array.

Description

Computes the element-wise inverse secant of the argument. For real argument with absolute value greater than 1 the result is real.

The following equalities hold: asec(z) == -acsc(-z) == asin(1/z) == %pi/2-asec(x) == %i*acsch(%i*z).

Sample

Examples

x=[1 2 -2 sqrt(2) -sqrt(2) 2/sqrt(3) -2/sqrt(3) -1];
asec(x)/%pi

See Also

  • sec — computes the element-wise secant of the argument
  • asecd — computes the element-wise inverse secant of the argument, results in degree.

References

  • Kahan, W., "Branch cuts for complex elementary functions, or, Much ado about nothing's sign bit", Proceedings of the joing IMA/SIAM conference on The State of the Art in Numerical Analysis, University of Birmingham, A. Iserles and M.J.D. Powell, eds, Clarendon Press, Oxford, 1987, 165-210.
Scilab Enterprises
Copyright (c) 2011-2017 (Scilab Enterprises)
Copyright (c) 1989-2012 (INRIA)
Copyright (c) 1989-2007 (ENPC)
with contributors
Last updated:
Mon Oct 01 17:34:42 CEST 2012