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  1. //-------------------------------------------------------------------//
  2.  
  3. //  Syntax:  atanh ( X )
  4.  
  5. //  Description:
  6.  
  7. //  Atanh is the inverse hyperbolic tangent of the element(s) of X.
  8.  
  9. //-------------------------------------------------------------------//
  10.  
  11. atanh = function ( x )
  12. {
  13.   return log ((1 + x) ./ (1 - x))/2;
  14. };
  15.