diff options
Diffstat (limited to 'blas/Rank2Update.h')
-rw-r--r-- | blas/Rank2Update.h | 54 |
1 files changed, 48 insertions, 6 deletions
diff --git a/blas/Rank2Update.h b/blas/Rank2Update.h index e7a5eeaba..0cf3a1961 100644 --- a/blas/Rank2Update.h +++ b/blas/Rank2Update.h @@ -28,9 +28,8 @@ struct rank2_update_selector<Scalar,Index,Upper> for (Index i=0; i<size; ++i) { - Map<PlainVector>(mat+stride*i, i+1) += - conj(alpha) * conj(_u[i]) * v.head(i+1) - + alpha * conj(_v[i]) * u.head(i+1); + Map<PlainVector>(mat+stride*i, i+1) += conj(alpha) * conj(_u[i]) * v.head(i+1) + + alpha * conj(_v[i]) * u.head(i+1); } } }; @@ -45,9 +44,52 @@ struct rank2_update_selector<Scalar,Index,Lower> for (Index i=0; i<size; ++i) { - Map<PlainVector>(mat+(stride+1)*i, size-i) += - conj(alpha) * conj(_u[i]) * v.tail(size-i) - + alpha * conj(_v[i]) * u.tail(size-i); + Map<PlainVector>(mat+(stride+1)*i, size-i) += conj(alpha) * conj(_u[i]) * v.tail(size-i) + + alpha * conj(_v[i]) * u.tail(size-i); + } + } +}; + +/* Optimized selfadjoint matrix += alpha * uv' + conj(alpha)*vu' + * The matrix is in packed form. + */ +template<typename Scalar, typename Index, int UpLo> +struct packed_rank2_update_selector; + +template<typename Scalar, typename Index> +struct packed_rank2_update_selector<Scalar,Index,Upper> +{ + static void run(Index size, Scalar* mat, const Scalar* _u, const Scalar* _v, Scalar alpha) + { + typedef Matrix<Scalar,Dynamic,1> PlainVector; + Map<const PlainVector> u(_u, size), v(_v, size); + Index offset = 0; + + for (Index i=0; i<size; ++i) + { + offset += i; + Map<PlainVector>(mat+offset, i+1) += conj(alpha) * conj(_u[i]) * v.head(i+1) + + alpha * conj(_v[i]) * u.head(i+1); + mat[offset+i] = real(mat[offset+i]); + } + } +}; + +template<typename Scalar, typename Index> +struct packed_rank2_update_selector<Scalar,Index,Lower> +{ + static void run(Index size, Scalar* mat, const Scalar* _u, const Scalar* _v, Scalar alpha) + { + typedef Matrix<Scalar,Dynamic,1> PlainVector; + Map<const PlainVector> u(_u, size), v(_v, size); + Index offset = 0; + + for (Index i=0; i<size; ++i) + { + Map<PlainVector>(mat+offset, size-i) += conj(alpha) * conj(_u[i]) * v.tail(size-i) + + alpha * conj(_v[i]) * u.tail(size-i); + mat[offset] = real(mat[offset]); + offset += size-i; } } }; |