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75da254fc3
* add a word about noalias and performance for BLAS users
20 lines
612 B
C++
20 lines
612 B
C++
#include <iostream>
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#include <Eigen/Dense>
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using namespace Eigen;
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int main()
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{
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Matrix2d mat;
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mat << 1, 2,
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3, 4;
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Vector2d u(-1,1), v(2,0);
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std::cout << "Here is mat*mat:\n" << mat*mat << std::endl;
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std::cout << "Here is mat*u:\n" << mat*u << std::endl;
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std::cout << "Here is u^T*mat:\n" << u.transpose()*mat << std::endl;
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std::cout << "Here is u^T*v:\n" << u.transpose()*v << std::endl;
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std::cout << "Here is u*v^T:\n" << u*v.transpose() << std::endl;
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std::cout << "Let's multiply mat by itself" << std::endl;
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mat = mat*mat;
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std::cout << "Now mat is mat:\n" << mat << std::endl;
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}
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