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  1. function y = atanh(z)
  2. %ATANH    Inverse hyperbolic tangent.
  3. %    ATANH(X) is the inverse hyperbolic tangent of the elements of X.
  4.  
  5. %    Copyright (c) 1984-93 by The MathWorks, Inc.
  6.  
  7. y = log((1 + z)./(1 - z))/2;
  8.