/// Sets the Jacobian, which is wi at any point.
void PoldiSpectrumLinearBackground::functionDeriv1DSpectrum(
const FunctionDomain1DSpectrum &domain, Jacobian &jacobian) {
double wsIndexDouble = static_cast<double>(domain.getWorkspaceIndex());
for (size_t i = 0; i < domain.size(); ++i) {
jacobian.set(i, 0, wsIndexDouble);
}
}
/**
* Calculates derivatives
*
* The method calculates derivatives of the wrapped profile function and
* transforms them into the correct domain.
*
* @param domain :: FunctionDomain1DSpectrum, containing a workspace index
* @param jacobian :: Jacobian matrix.
*/
void PoldiSpectrumDomainFunction::functionDeriv1DSpectrum(
const FunctionDomain1DSpectrum &domain, Jacobian &jacobian) {
size_t index = domain.getWorkspaceIndex();
Poldi2DHelper_sptr helper = m_2dHelpers[index];
if (helper) {
size_t domainSize = domain.size();
double fwhm = m_profileFunction->fwhm();
double centre = m_profileFunction->centre();
double dWidth = 2.0 * fwhm;
double dCalcMin = centre - dWidth;
size_t dWidthN = static_cast<size_t>(
std::max(2, 2 * static_cast<int>(dWidth / helper->deltaD) + 1));
int pos = 0;
for (size_t i = 0; i < helper->domain->size(); ++i) {
if ((*(helper->domain))[i] >= dCalcMin) {
pos = static_cast<int>(i + 1);
break;
}
}
size_t baseOffset = static_cast<size_t>(pos + helper->minTOFN);
for (size_t i = 0; i < helper->dOffsets.size(); ++i) {
double newD = centre + helper->dFractionalOffsets[i];
size_t offset = static_cast<size_t>(helper->dOffsets[i]) + baseOffset;
WrapAroundJacobian smallJ(jacobian, offset, helper->factors, pos,
domainSize);
m_profileFunction->setCentre(newD);
m_profileFunction->functionDerivLocal(
&smallJ, helper->domain->getPointerAt(pos), dWidthN);
}
m_profileFunction->setCentre(centre);
}
}