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r1mpyq.h
1namespace Eigen {
2
3namespace internal {
4
5// TODO : move this to GivensQR once there's such a thing in Eigen
6
7template <typename Scalar>
8void r1mpyq(DenseIndex m, DenseIndex n, Scalar *a, const std::vector<JacobiRotation<Scalar> > &v_givens, const std::vector<JacobiRotation<Scalar> > &w_givens)
9{
10 typedef DenseIndex Index;
11
12 /* apply the first set of givens rotations to a. */
13 for (Index j = n-2; j>=0; --j)
14 for (Index i = 0; i<m; ++i) {
15 Scalar temp = v_givens[j].c() * a[i+m*j] - v_givens[j].s() * a[i+m*(n-1)];
16 a[i+m*(n-1)] = v_givens[j].s() * a[i+m*j] + v_givens[j].c() * a[i+m*(n-1)];
17 a[i+m*j] = temp;
18 }
19 /* apply the second set of givens rotations to a. */
20 for (Index j = 0; j<n-1; ++j)
21 for (Index i = 0; i<m; ++i) {
22 Scalar temp = w_givens[j].c() * a[i+m*j] + w_givens[j].s() * a[i+m*(n-1)];
23 a[i+m*(n-1)] = -w_givens[j].s() * a[i+m*j] + w_givens[j].c() * a[i+m*(n-1)];
24 a[i+m*j] = temp;
25 }
26}
27
28} // end namespace internal
29
30} // end namespace Eigen
Namespace containing all symbols from the Eigen library.
EIGEN_DEFAULT_DENSE_INDEX_TYPE Index