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add trace for ImmutableMatrix

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Olivier Parcollet 2014-01-12 20:46:10 +01:00
parent 92f4df91fe
commit 0f85b08693
1 changed files with 10 additions and 0 deletions
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10
triqs/arrays/matrix.hpp
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@ -222,6 +222,16 @@ namespace triqs { namespace arrays {
return a;
}
template <typename M>
TYPE_ENABLE_IF(typename M::value_type, ImmutableMatrix<M>) trace(M const &m) {
auto r = typename M::value_type{};
if (first_dim(m) != second_dim(m))
TRIQS_RUNTIME_ERROR << " Trace of a non square matrix";
auto d = first_dim(m);
for (int i = 0; i < d; ++i)
r += m(i, i);
return r;
}
}}//namespace triqs::arrays
// The std::swap is WRONG for a view because of the copy/move semantics of view.