ATH

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ath returns its parameter's hyperbolic arc-tangent.

 

Syntax

   ath(num_exp)

 

Parameters

Element

Description

Restrictions

num_exp

Numeric Expression

-1 < num_exp < 1

Examples

   Y = ath(1/X)

 

Description and Comments

ath(X) returns ln((1+X)/(1-X))/2.

ath is the inverse of the th function.

The result is the Double type.

 

Associated Errors

Error

Description

ERMODE (10)

The parameter is not numeric.

ERTRIH (15)

Ÿ exp_num Ÿ >= 1

 

Associated Keywords

ASH - ACH - CH - SH - TH


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