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src
Power.cc
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// -*- C++ -*-
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// $Id: Power.cc,v 1.4 2003/10/10 17:40:39 garren Exp $
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#include "
CLHEP/GenericFunctions/Power.hh
"
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#include <cmath>
// for pow()
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namespace
Genfun {
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FUNCTION_OBJECT_IMP
(Power)
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Power
::
Power
(
int
n
):
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_intPower(
n
),
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_asInteger(true)
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{}
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Power::Power
(
unsigned
int
n
):
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_intPower(n),
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_asInteger(true)
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{}
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Power::Power
(
double
n
):
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_doublePower(n),
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_asInteger(false)
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{}
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Power::Power
(
const
Power
& right)
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: _doublePower(right._doublePower),
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_intPower(right._intPower),
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_asInteger(right._asInteger)
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{}
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Power::~Power
() {
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}
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double
Power::operator()
(
double
x)
const
{
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if
(_asInteger) {
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if
(_intPower==0) {
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return
1;
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}
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else
if
(_intPower>0) {
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double
f
= 1;
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for
(
int
i=0;i<_intPower;i++) {
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f *=x;
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}
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return
f
;
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}
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else
{
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double
f
= 1;
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for
(
int
i=0;i<-_intPower;i++) {
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f /=x;
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}
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return
f
;
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}
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}
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else
{
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return
pow(x,_doublePower);
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}
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}
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Derivative
Power::partial
(
unsigned
int
index)
const
{
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if
(_asInteger) {
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const
AbsFunction
& fPrime = _intPower*
Power
(_intPower-1);
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return
Derivative
(&fPrime);
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}
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else
{
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const
AbsFunction
& fPrime = _doublePower*
Power
(_doublePower-1);
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return
Derivative
(&fPrime);
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}
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}
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}
// namespace Genfun
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