/usr/include/casacore/scimath/Functionals/PoissonFunction2.tcc is in casacore-dev 2.2.0-2.
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//# Associated Universities, Inc. Washington DC, USA.
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//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
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//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
//# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
//# License for more details.
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//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
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//# Internet email: aips2-request@nrao.edu.
//# Postal address: AIPS++ Project Office
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//# $Id: Array.h 21545 2015-01-22 19:36:35Z gervandiepen $
#ifndef SCIMATH_POISSONFUNCTION2_TCC
#define SCIMATH_POISSONFUNCTION2_TCC
//# Includes
#include <casacore/scimath/Functionals/PoissonFunction.h>
#include <casacore/casa/BasicMath/Math.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
//# Constructors
//# Operators
template<class T>
AutoDiff<T> PoissonFunction<AutoDiff<T> >::
eval(typename Function<AutoDiff<T> >::FunctionArg x) const {
AutoDiff<T> tmp;
if (param_p[LAMBDA].nDerivatives() > 0){
tmp = param_p[LAMBDA];
}
else if (param_p[HEIGHT].nDerivatives() > 0 ){
tmp = param_p[HEIGHT];
}
// function value
int xVal = static_cast<int>(x[0]);
double lambdaVal = param_p[LAMBDA].value();
double heightVal = param_p[HEIGHT].value();
tmp.value() = heightVal * ( pow( lambdaVal, xVal ) *
exp(-1 * lambdaVal ) / Combinatorics::factorial( xVal ));
// get derivatives (assuming either all or none)
if (tmp.nDerivatives()>0) {
for (uInt j=0; j<tmp.nDerivatives(); j++){
tmp.deriv(j) = 0.0;
}
if (param_p.mask(LAMBDA)){
tmp.deriv(LAMBDA) = heightVal * ( xVal * pow(lambdaVal, xVal - 1) - pow(lambdaVal,xVal))*exp(-1*lambdaVal) /
Combinatorics::factorial( xVal);
}
if ( param_p.mask(HEIGHT)){
tmp.deriv(HEIGHT) = pow( lambdaVal, xVal )* exp(-1*lambdaVal) /
Combinatorics::factorial( xVal );
}
}
return tmp;
}
//# Member functions
} //# NAMESPACE CASACORE - END
#endif
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