Alexandria 2.31.0
SDC-CH common library for the Euclid project
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#include <Distances.h>
Static Public Member Functions | |
template<typename Scale , typename Iterator > | |
static auto | distance (Scale scale, Iterator ref_begin, Iterator ref_end, Iterator target_begin) -> decltype(ref_begin->getFlux()) |
template<typename Iterator > | |
static auto | guessScale (Iterator ref_begin, Iterator ref_end, Iterator target_begin) -> decltype(ref_begin->getFlux()) |
template<typename Scale , typename Iterator > | |
static auto | daDistance (Scale scale, Iterator ref_begin, Iterator ref_end, Iterator target_begin) -> decltype(ref_begin->getFlux()) |
Implement the distance (with scale factor), partial derivative of the distance wrt scale factor, and scale guessing for the χ^2 distance
Definition at line 31 of file Distances.h.
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inlinestatic |
Implement the derivative of the chi2 distance
\[ \frac{\delta}{\delta a}\left[ \frac{(a f_{ref} - f_{target})^2}{(a e_{ref})^2 + e_{target}^2}\right] = \frac{2 *(a f_{ref} - f_{target}) (e_{ref}^2 a f_{target} + f_{ref} e_{target}^2)}{(e_{ref}^2 a^2 + e_{target}^2)^2} \]
Definition at line 89 of file Distances.h.
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inlinestatic |
χ^2 distance
Scale | |
Iterator |
scale | |
ref_begin | |
ref_end | |
target_begin |
Definition at line 44 of file Distances.h.
Referenced by Euclid::MathUtils::Likelihood::weight(), and Euclid::MathUtils::InverseChi2::weight().
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inlinestatic |
Guess the scale factor for the reference object
Iterator |
ref_begin | |
ref_end | |
target_begin |
Definition at line 70 of file Distances.h.