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Aide Scilab >> Fonctions Elémentaires > Trigonométrie > acsc


computes the element-wise inverse cosecant of the argument.

Calling Sequence

y = acsc(x)



a real or complex array.


a real or complex array.


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

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



x=[-x($:-1:1) %nan x];

See Also

  • csc — cosécante des éléments de l'argument.
  • acscd — computes the element-wise inverse cosecant of the argument, results in degree.
  • acsch — computes the element-wise inverse hyperbolic cosecant of the argument.


  • 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.
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Last updated:
Mon Oct 01 17:37:13 CEST 2012