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GenericFunctions
src
ATan.cc
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// -*- C++ -*-
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// $Id: ATan.cc,v 1.4 2003/10/10 17:40:39 garren Exp $
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#include "
CLHEP/GenericFunctions/ATan.hh
"
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#include "
CLHEP/GenericFunctions/Square.hh
"
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#include <assert.h>
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#include <cmath>
// for atan()
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namespace
Genfun {
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FUNCTION_OBJECT_IMP
(ATan)
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ATan
::
ATan
()
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{}
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ATan::~ATan
() {
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}
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ATan::ATan
(
const
ATan
& right) :
AbsFunction
(right)
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{ }
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double
ATan::operator()
(
double
x)
const
{
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return
atan(x);
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}
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Derivative
ATan::partial
(
unsigned
int
index)
const
{
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assert(index==0);
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Square
square;
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const
AbsFunction
& fPrime=1.0/(1.0+square);;
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return
Derivative
(& fPrime);
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}
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}
// end namespace Genfun
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