DenseGenMatProd.h
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1 // Copyright (C) 2016-2019 Yixuan Qiu <yixuan.qiu@cos.name>
2 //
3 // This Source Code Form is subject to the terms of the Mozilla
4 // Public License v. 2.0. If a copy of the MPL was not distributed
5 // with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
6 
7 #ifndef DENSE_GEN_MAT_PROD_H
8 #define DENSE_GEN_MAT_PROD_H
9 
10 #include <Eigen/Core>
11 
12 namespace Spectra {
13 
19 
28 template <typename Scalar>
30 {
31 private:
38 
39  ConstGenericMatrix m_mat;
40 
41 public:
50  DenseGenMatProd(ConstGenericMatrix& mat) :
51  m_mat(mat)
52  {}
53 
57  Index rows() const { return m_mat.rows(); }
61  Index cols() const { return m_mat.cols(); }
62 
69  // y_out = A * x_in
70  void perform_op(const Scalar* x_in, Scalar* y_out) const
71  {
72  MapConstVec x(x_in, m_mat.cols());
73  MapVec y(y_out, m_mat.rows());
74  y.noalias() = m_mat * x;
75  }
76 };
77 
78 } // namespace Spectra
79 
80 #endif // DENSE_GEN_MAT_PROD_H
SCALAR Scalar
Definition: bench_gemm.cpp:46
Scalar * y
void perform_op(const Scalar *x_in, Scalar *y_out) const
A matrix or vector expression mapping an existing array of data.
Definition: Map.h:94
Eigen::Matrix< Scalar, Eigen::Dynamic, Eigen::Dynamic > Matrix
const Eigen::Ref< const Matrix > ConstGenericMatrix
Eigen::Matrix< Scalar, Eigen::Dynamic, 1 > Vector
ConstGenericMatrix m_mat
EIGEN_DEFAULT_DENSE_INDEX_TYPE Index
The Index type as used for the API.
Definition: Meta.h:74
Eigen::Map< Vector > MapVec
DenseGenMatProd(ConstGenericMatrix &mat)
Eigen::Map< const Vector > MapConstVec
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autogenerated on Tue Jul 4 2023 02:34:09