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//# Polynomial2.cc: One dimensional polynomial class specialized for AutoDiff
//# Copyright (C) 2001,2002
//# Associated Universities, Inc. Washington DC, USA.
//#
//# 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
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library is distributed in the hope that it will be useful, but WITHOUT
//# 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.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//# Internet email: casa-feedback@nrao.edu.
//# Postal address: AIPS++ Project Office
//# National Radio Astronomy Observatory
//# 520 Edgemont Road
//# Charlottesville, VA 22903-2475 USA
#ifndef SCIMATH_POWERLOGARITHMICPOLYNOMIAL2_TCC
#define SCIMATH_POWERLOGARITHMICPOLYNOMIAL2_TCC
//# Includes
#include <casacore/scimath/Functionals/PowerLogarithmicPolynomial.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
//# Constructors
//# Operators
template<class T>
AutoDiff<T> PowerLogarithmicPolynomial<AutoDiff<T> >::
eval(typename Function<AutoDiff<T> >::FunctionArg x) const {
AutoDiff<T> tmp;
for (uInt i=0; i<this->nparameters(); ++i) {
if (this->param_p[i].nDerivatives() > 0) {
tmp = this->param_p[i];
break;
}
}
// function value
T lnx = log(x[0]);
Int j = nparameters();
T accum = this->param_p[--j].value();
while (--j >= 1) {
accum *= lnx;
accum += param_p[j].value();
}
T value = param_p[0].value()*pow(x[0], accum);
tmp.value() = value;
// get derivatives
Double prod = value;
if (tmp.nDerivatives() > 0) {
for (uInt j=0; j<tmp.nDerivatives(); j++) {
tmp.deriv(j) = 0.0;
}
for (uInt i=0; i<this->nparameters(); ++i) {
if (i == 0 && this->param_p.mask(0)) {
tmp.deriv(0) = value/this->param_p[0].value();
}
else {
prod *= lnx;
if (this->param_p.mask(i)) {
tmp.deriv(i) = prod;
}
}
}
}
return tmp;
}
//# Member functions
} //# NAMESPACE CASACORE - END
#endif
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