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86220784b6
1) Eigen2 co-installable with Eigen1 without conflict, without affecting programs including either. 2) #include<Eigen/Core> without the .h without conflict with the Core/ directory 3) Uniformize coding style of the CMakeLists.
29 lines
787 B
C++
29 lines
787 B
C++
#include <Eigen/Core>
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USING_PART_OF_NAMESPACE_EIGEN
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using namespace std;
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template<typename Scalar, typename Derived>
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const Eigen::Eval<Eigen::Transpose<Derived> >
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evaluatedTranspose(const MatrixBase<Scalar, Derived>& m)
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{
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return m.transpose().eval();
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}
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int main(int, char**)
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{
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Matrix2f M = Matrix2f::random();
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Matrix2f m;
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m = M;
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cout << "Here is the matrix m:" << endl << m << endl;
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cout << "Now we want to replace m by its own transpose." << endl;
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cout << "If we do m = m.transpose(), then m becomes:" << endl;
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m = m.transpose();
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cout << m << endl << "which is wrong!" << endl;
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cout << "Now let us instead do m = evaluatedTranspose(m). Then m becomes" << endl;
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m = M;
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m = evaluatedTranspose(m);
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cout << m << endl << "which is right." << endl;
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return 0;
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}
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