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◆ Chi()
| Function Chi |
( |
X As |
Double, |
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Optional Info As |
Long |
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) |
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Hyperbolic cosine integral Chi(x)
- Purpose
- Computes the hyperbolic cosine integral.
Chi(x) = ∫ (cosh(t)-1)/t dt [0, x] + ln(x) + γ (γ: Euler 's constant)
Function Chi(X As Double, Optional Info As Long) As Double Hyperbolic cosine integral Chi(x)
- Returns
- Double
Hyperbolic cosine integral Chi(x).
- Parameters
-
| [in] | X | Argument x. (x != 0)
(If x < 0, returns the real part = Chi(|x|)) |
| [out] | Info | (Optional)
= 0: Successful exit.
= -1: The argument X had an illegal value. (X = 0)
= 1: Floating point range error. |
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1.9.7