2-Jul-96, 6:54:35
Routine Save for Hyperbolic Trigonometry Library function $%ARCTANH^MATH
 ;
 ; Unless otherwise noted, the code below
 ; was approved in document X11/95-13
 ;
 ; If corrections have been applied,
 ; first the original line appears,
 ; with three semicolons at the beginning of the line.
 ;
 ; Then the source of the correction is acknowledged,
 ; then the corrected line appears, followed by a
 ; line containing three semicolons.
 ;
ARCTANH(X,PREC) ;
 If X<-1 Set $Ecode=",M28,"
 If X>1 Set $Ecode=",M28,"
 ;
 ;;;
 ; Winfried Gerum (8 June 1995)
 ; Alan Frank (October 1995)
 Set PREC=$Get(PREC,11)
 ;;;
 ;
 Quit $%LOG^MATH(1+X/(1-X),PREC)/2
 ;===
 ;
 ;
 ;