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Please note that the recommended version of Scilab is 6.1.1. This page might be outdated.
See the recommended documentation of this function

# asec

computa o arco-secante elemento a elemento do argumento

### Seqüência de Chamamento

`y = asec(x)`

### Parâmetros

x

array de reais ou complexos

y

array de reais ou complexos

### Descrição

computa o arco-secante elemento a elemento do argumento. Para valores reais com valores absolutos maiores que 1, o resultado é real

As seguintes igualdades se verificam: ```asec(z) = -acsc(-z) = asin(1/z) = %pi/2-asec(x) = %i*acsch(%i*z)```

### Exemplos

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

### Referências

• 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.

### Autor

• Serge Steer, INRIA

### Comments

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 << acsch Trigonometria asecd >>

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