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```00001 // \$Id\$
00002 // \$Source\$
00004 // ***********************************************************************
00005 //
00007 //                 Copyright (2006) Sandia Corporation
00008 //
00009 // Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
00010 // the U.S. Government retains certain rights in this software.
00011 //
00012 // This library is free software; you can redistribute it and/or modify
00013 // it under the terms of the GNU Lesser General Public License as
00014 // published by the Free Software Foundation; either version 2.1 of the
00016 //
00017 // This library is distributed in the hope that it will be useful, but
00018 // WITHOUT ANY WARRANTY; without even the implied warranty of
00019 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00020 // Lesser General Public License for more details.
00021 //
00022 // You should have received a copy of the GNU Lesser General Public
00023 // License along with this library; if not, write to the Free Software
00024 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00025 // USA
00026 // Questions? Contact David M. Gay (dmgay@sandia.gov) or Eric T. Phipps
00027 // (etphipp@sandia.gov).
00028 //
00029 // ***********************************************************************
00031
00034
00035 #include <cmath>        // for most math functions
00036 #include <algorithm>  // for std::min and std::max
00037
00038 // Define some math functions that aren't usually in cmath
00039 namespace std {
00040   inline float acosh(float x) {
00041     return std::log(x + std::sqrt(x*x - float(1.0))); }
00042   inline float asinh(float x) {
00043     return std::log(x + std::sqrt(x*x + float(1.0))); }
00044   inline float atanh(float x) {
00045     return float(0.5)*std::log((float(1.0)+x)/(float(1.0)-x)); }
00046
00047   inline double acosh(double x) {
00048     return std::log(x + std::sqrt(x*x - double(1.0))); }
00049   inline double asinh(double x) {
00050     return std::log(x + std::sqrt(x*x + double(1.0))); }
00051   inline double atanh(double x) {
00052     return double(0.5)*std::log((double(1.0)+x)/(double(1.0)-x)); }
00053 }
00054