如何在C ++中使用特征库进行矩阵分割 [英] How to perform matrix matrix division using eigen library in C++
问题描述
我做了一个`MATLAB`代码，它必须执行
B2 = abs（B2 / max（B2）） ;
其中`B2`是一个`nxm`矩阵。什么应该是使用Eigen库的等效`C ++`代码？请帮忙。
修改我的代码
//问题
#include< iostream>
#include< complex.h>
#include< eigen3 eigen =dense =>
#include< eigen3 eigen =core =>
使用名称空间Eigen;
使用名称空间std;
使用Eigen :: MatrixXd;
int main（）
{
MatrixXd A（2,2）; MatrixXd B（2,1）; MatrixXd C（1,2）;
A<<<< 4,12，
6,8;
C = A.colwise（）。maxCoeff（）;
//B=(A*(1.0/C））。cwiseAbs（）;
B = A.array（）/ C.array（）;
cout<< 解决方案是A：\ n<< B.cwiseAbs（）<<结束;
返回0;
}
什么我试过了：
但我无法执行此代码。
hp @ hp-HP-Notebook：〜/ beamforming / programs / eigen_prog $ g ++ mm_t.cpp -o mm_t
hp @ hp -HP-Notebook：〜/ beamforming / programs / eigen_prog $ ./mm_t
mm_t：/usr/local/include/eigen3/Eigen/src/Core/CwiseBinaryOp.h:110:Eigen :: CwiseBinaryOp< BinaryOp，Lhs，Rhs> :: CwiseBinaryOp（const Lhs&，const Rhs&，const BinaryOp&）[with BinaryOp = Eigen :: internal :: scalar_quotient_op< double，double> ;; LhsType = const Eigen :: ArrayWrapper< Eigen :: Matrix< double，-1，-1>取代; RhsType = const Eigen :: ArrayWrapper< Eigen :: Matrix< double，-1，-1>取代; Eigen :: CwiseBinaryOp< BinaryOp，Lhs，Rhs> :: Lhs = Eigen :: ArrayWrapper< Eigen :: Matrix< double，-1，-1>取代; Eigen :: CwiseBinaryOp< BinaryOp，Lhs，Rhs> :: Rhs = Eigen :: ArrayWrapper< Eigen :: Matrix< double，-1，-1> >]：断言`aLhs.rows（）== aRhs.rows（）&& aLhs.cols（）== aRhs.cols（）'失败。
流产（核心倾销）
任何想法有什么问题？ ？请帮忙。
I did a `MATLAB` code and it had to perform
B2=abs(B2/max(B2));
where `B2` is an `n x m` matrix . What should be the equivalent `C++` code using Eigen library? Please help.
On modifying my code
//problem
#include <iostream>
#include<complex.h>
#include <eigen3 eigen="" dense="">
#include <eigen3 eigen="" core="">
using namespace Eigen;
using namespace std;
using Eigen::MatrixXd;
int main()
{
MatrixXd A(2,2);MatrixXd B(2,1);MatrixXd C(1,2);
A<<4,12,
6,8;
C=A.colwise().maxCoeff();
//B=(A*(1.0/C)).cwiseAbs();
B=A.array()/C.array();
cout << "The solution is A :\n" << B.cwiseAbs()<< endl;
return 0;
}
What I have tried:
But I am not able to execute this code.
hp@hp-HP-Notebook:~/beamforming/programs/eigen_prog$ g++ mm_t.cpp -o mm_t
hp@hp-HP-Notebook:~/beamforming/programs/eigen_prog$ ./mm_t
mm_t: /usr/local/include/eigen3/Eigen/src/Core/CwiseBinaryOp.h:110: Eigen::CwiseBinaryOp<BinaryOp, Lhs, Rhs>::CwiseBinaryOp(const Lhs&, const Rhs&, const BinaryOp&) [with BinaryOp = Eigen::internal::scalar_quotient_op<double, double>; LhsType = const Eigen::ArrayWrapper<Eigen::Matrix<double, -1, -1> >; RhsType = const Eigen::ArrayWrapper<Eigen::Matrix<double, -1, -1> >; Eigen::CwiseBinaryOp<BinaryOp, Lhs, Rhs>::Lhs = Eigen::ArrayWrapper<Eigen::Matrix<double, -1, -1> >; Eigen::CwiseBinaryOp<BinaryOp, Lhs, Rhs>::Rhs = Eigen::ArrayWrapper<Eigen::Matrix<double, -1, -1> >]: Assertion `aLhs.rows() == aRhs.rows() && aLhs.cols() == aRhs.cols()' failed.
Aborted (core dumped)
Any idea what is wrong?? Please help.
推荐答案
g ++ mm_t.cpp -o mm_t
hp @ hp-HP-Notebook ：〜/ beamforming / programs / eigen_prog
g++ mm_t.cpp -o mm_t
hp@hp-HP-Notebook:~/beamforming/programs/eigen_prog
./ mm_t
mm_t：/usr/local/include/eigen3/Eigen/src/Core/CwiseBinaryOp.h ：110：Eigen :: CwiseBinaryOp< BinaryOp，Lhs，Rhs> :: CwiseBinaryOp（const Lhs&，const Rhs&，const BinaryOp&）[with BinaryOp = Eigen :: internal :: scalar_quotient_op< double，double> ;; LhsType = const Eigen :: ArrayWrapper< Eigen :: Matrix< double，-1，-1>取代; RhsType = const Eigen :: ArrayWrapper< Eigen :: Matrix< double，-1，-1>取代; Eigen :: CwiseBinaryOp< BinaryOp，Lhs，Rhs> :: Lhs = Eigen :: ArrayWrapper< Eigen :: Matrix< double，-1，-1>取代; Eigen :: CwiseBinaryOp< BinaryOp，Lhs，Rhs> :: Rhs = Eigen :: ArrayWrapper< Eigen :: Matrix< double，-1，-1> >]：断言`aLhs.rows（）== aRhs.rows（）&& aLhs.cols（）== aRhs.cols（）'失败。
流产（核心倾销）
任何想法有什么问题？ ？请帮忙。
./mm_t
mm_t: /usr/local/include/eigen3/Eigen/src/Core/CwiseBinaryOp.h:110: Eigen::CwiseBinaryOp<BinaryOp, Lhs, Rhs>::CwiseBinaryOp(const Lhs&, const Rhs&, const BinaryOp&) [with BinaryOp = Eigen::internal::scalar_quotient_op<double, double>; LhsType = const Eigen::ArrayWrapper<Eigen::Matrix<double, -1, -1> >; RhsType = const Eigen::ArrayWrapper<Eigen::Matrix<double, -1, -1> >; Eigen::CwiseBinaryOp<BinaryOp, Lhs, Rhs>::Lhs = Eigen::ArrayWrapper<Eigen::Matrix<double, -1, -1> >; Eigen::CwiseBinaryOp<BinaryOp, Lhs, Rhs>::Rhs = Eigen::ArrayWrapper<Eigen::Matrix<double, -1, -1> >]: Assertion `aLhs.rows() == aRhs.rows() && aLhs.cols() == aRhs.cols()' failed.
Aborted (core dumped)
Any idea what is wrong?? Please help.
你需要了解矩阵背后的数学：
如何划分矩阵（带图片） - wikiHow [ ^ ]
你不能直接在另一个矩阵上划分一个矩阵。
You need to understand the math behind the matrix:
How to Divide Matrices (with Pictures) - wikiHow[^]
You cant divide one matrix on another matrix directly.
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