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32 lines
642 B
Plaintext
32 lines
642 B
Plaintext
NAME
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tanh - hyperbolic tangent
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SYNOPSIS
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tanh(x [,eps])
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TYPES
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x real
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eps nonzero real, defaults to epsilon()
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return real
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DESCRIPTION
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Calculate the tanh of x to the nearest or next to nearest multiple of
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epsilon, with absolute error less than .75 * abs(eps).
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tanh(x) = (exp(2*x) - 1)/(exp(2*x) + 1)
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EXAMPLE
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> print tanh(1, 1e-5), tanh(1, 1e-10), tanh(1, 1e-15), tanh(1, 1e-20)
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.76159 .761594156 .761594155955765 .76159415595576488812
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LIMITS
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unlike sin and cos, x must be real
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eps > 0
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LIBRARY
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NUMBER *qtanh(NUMBER *x, NUMBER *eps)
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SEE ALSO
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sinh, cosh, sech, csch, coth, epsilon
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