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ASINH

ASINH

Name


    ASINH

Purpose


    Return the inverse hyperbolic sine of the argument

Explanation


    The inverse hyperbolic sine is used for the calculation of asinh
    magnitudes, see Lupton et al. (1999, AJ, 118, 1406)

Calling Sequence


    result = asinh( x)

Inputs


    X - hyperbolic sine, numeric scalar or vector or multidimensional array
        (not complex)

Output


    result - inverse hyperbolic sine, same number of elements as X
              double precision if X is double, otherwise floating pt.

Method


    Expression given in Numerical Recipes, Press et al. (1992), eq. 5.6.7
    Note that asinh(-x) = -asinh(x) and that asinh(0) = 0. and that
    if y = asinh(x) then x = sinh(y).

Revision History


    Written W. Landsman February, 2001
    Work for multi-dimensional arrays W. Landsman August 2002
    Simplify coding, and work for scalars again W. Landsman October 2003



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