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statistics : fix get_value_type detection

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- clean a bit the auto_correlation_time
This commit is contained in:
Olivier Parcollet 2014-04-17 13:28:11 +02:00
parent 2c6da6a35a
commit b1508a07ff
1 changed files with 22 additions and 13 deletions
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35
triqs/statistics/statistics.hpp
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@ -287,6 +287,13 @@ namespace statistics {
return l.res;
}
// ------------- A trait to get the value_type of an expression of observables----------
template <typename ObservableExpr> struct _get_value_type {
using type = decltype(eval(std::declval<ObservableExpr>(), 0));
};
template <typename ObservableExpr> using get_value_type = typename _get_value_type<ObservableExpr>::type;
/* *********************************************************
*
* Average and error
@ -355,14 +362,14 @@ namespace statistics {
}
template <typename ObservableExpr>
std::c14::enable_if_t<clef::is_clef_expression<ObservableExpr>::value, value_and_error_bar<double>>
std::c14::enable_if_t<clef::is_clef_expression<ObservableExpr>::value, value_and_error_bar<get_value_type<ObservableExpr>>>
average_and_error(ObservableExpr const& obs) {
auto expr_jack = eval(obs, repl_by_jack{}); // replace every TS leaf by a jacknifed version
return empirical_average_and_error(make_immutable_time_series(expr_jack));
}
template <typename ObservableExpr>
std::c14::enable_if_t<clef::is_clef_expression<ObservableExpr>::value, value_and_error_bar<double>>
std::c14::enable_if_t<clef::is_clef_expression<ObservableExpr>::value, value_and_error_bar<get_value_type<ObservableExpr>>>
average_and_error(ObservableExpr const& obs, int bin_size) {
auto expr_bin_jack = eval(obs, bin_and_repl_by_jack{bin_size});
return empirical_average_and_error(make_immutable_time_series(expr_bin_jack));
@ -420,7 +427,8 @@ namespace statistics {
auto t_cor = [&](int b) {
auto A_binned = make_binned_series(make_immutable_time_series(A), b);
double var = empirical_variance(A_binned);
using std::abs;
double var = abs(empirical_variance(A_binned));
return 0.5 * (b * var / intrinsic_variance - 1.);
};
@ -463,27 +471,28 @@ namespace statistics {
return empirical_average(t);
}
template<typename TimeSeries>
double t_cor(TimeSeries const & A, int bin_size, double var1){
double var = empirical_variance(A);
return .5 * var / var1 * bin_size;
}
template <typename TimeSeries> double autocorrelation_time_from_binning(TimeSeries const& A) {
using std::abs;
auto size = make_immutable_time_series(A).size();
double var1 = empirical_variance(make_immutable_time_series(A));
double var1 = abs(empirical_variance(make_immutable_time_series(A)));
int B = 2;
auto Ab=make_binned_series(A,2);
double autocorr_time = t_cor(Ab, B, var1);
auto t_cor = [&Ab](int bin_size, double var1) {
using std::abs;
double var = abs(empirical_variance(Ab));
return .5 * var / var1 * bin_size;
};
double autocorr_time = t_cor(B, var1);
double slope = 1.;
int small_slope_count = 0;
std::vector<double> t;
while (small_slope_count < 5 && B < size / 10) {
B*=2;
Ab=make_binned_series(Ab,2);
double t_cor_new = t_cor(Ab, B, var1);
double t_cor_new = t_cor(B, var1);
slope = (std::abs(t_cor_new - autocorr_time) / autocorr_time);
if (slope < .5*1e-1) small_slope_count++;
if (small_slope_count > 0) t.push_back(t_cor_new);