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Fix #122

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- the conj_ function was not written properly
  (T is a ref, the trait is_complex was not returning true).
- a simpler version is clearly better !
This commit is contained in:
Olivier Parcollet 2014-09-08 20:44:11 +02:00
parent 7cf7d09c77
commit e6234ed3d5
2 changed files with 19 additions and 10 deletions
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16
test/triqs/arrays/dot.cpp
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@ -33,7 +33,7 @@ template<typename Vd, typename Vi>
void test() {
Vd a(2),aa(2),c(2) ;a()=2.0; c() = 1;
Vi b(2);b()=3;
std::cout << blas::dot<false>(a,b) << std::endl;
std::cerr << blas::dot<false>(a,b) << std::endl;
aa = 2*a;
@ -51,7 +51,19 @@ void test() {
int main(int argc, char **argv) {
test<vector<double> , vector<int> >();
/// Added by I. Krivenko, #122
/// test the complex version, specially with the zdotu workaround on Os X.
vector<std::complex<double>> v(2);
v(0) = 0;
v(1) = {0, 1};
std::cerr << v << std::endl;
std::cerr << blas::dot<false>(v, v) << std::endl;
std::cerr << blas::dot<true>(v, v) << std::endl;
assert_close( dot(v,v), -1);
assert_close( dotc(v,v), 1);
// does not work for array just because of .size() vs .shape(0)...
//test<array<double,1> , array<int,1> >();
//test<array<double,1> , vector<int> >();

13
triqs/arrays/blas_lapack/dot.hpp
View File

@ -67,13 +67,10 @@ namespace triqs { namespace arrays { namespace blas {
//return f77::dot(X.size(), Cx().data_start(), Cx().stride(), Cy().data_start(), Cy().stride());
}
template< bool Star, typename T>
typename std::enable_if<triqs::is_complex<T>::value && Star,T>::type
_conj(T && x) { return conj(std::forward<T>(x));}
template< bool Star, typename T>
typename std::enable_if<!( triqs::is_complex<T>::value && Star),T>::type
_conj(T && x) { return std::forward<T>(x);}
template <bool Star> std::complex<double> _conj(std::complex<double> const& x);
template <> std::complex<double> _conj<true>(std::complex<double> const& x) { return conj(x); }
template <> std::complex<double> _conj<false>(std::complex<double> const& x) { return x;}
template <bool Star> double _conj(double x) { return x; }
/**
* Calls dot product of 2 vectors.
@ -94,7 +91,7 @@ namespace triqs { namespace arrays { namespace blas {
auto * restrict X_ = X.data_start();
auto * restrict Y_ = Y.data_start();
if ((incx==1) && (incy==1)) {
for (size_t i=0; i<N; ++i) res += _conj<Star>(X_[i]) * Y_[i];
for (size_t i = 0; i < N; ++i) res += _conj<Star>(X_[i]) * Y_[i];
}
else { // code for unequal increments or equal increments not equal to 1
for (size_t i=0, ix=0, iy=0; i<N; ++i, ix += incx, iy +=incy) {res += _conj<Star>(X_[ix]) * Y_[iy]; }