ATH |
ath returns its parameter's hyperbolic arc-tangent.
ath(num_exp)
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Element |
Description |
Restrictions |
|
num_exp |
Numeric Expression |
-1 < num_exp < 1 |
Y = ath(1/X)
ath(X) returns ln((1+X)/(1-X))/2.
ath is the inverse of the th function.
The result is the Double type.
|
Error |
Description |
|
ERMODE (10) |
The parameter is not numeric. |
|
ERTRIH (15) |
Ÿ exp_num Ÿ >= 1 |
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