Eigen and std::vector

by

Eigen uses contiguous memory, as does std::vector. However, the outer std::vector contains a contiguous set of std::vector<std::complex<double> >, each pointing to a different set of complex numbers (and can be different lengths). Therefore, the std “matrix” is not contiguous. What you can do is copy the data to the Eigen matrix, there are multiple ways of doing that. The simplest would be to loop over i and j, with a better option being something like

Eigen::MatrixXcd mat(rows, cols);
for(int i = 0; i < cols; i++)
    mat.col(i) = Eigen::Map<Eigen::VectorXcd> (A[i].data(), rows);

More Related Contents:

  1. OpenCV CV::Mat and Eigen::Matrix
  2. Initialise Eigen::vector with std::vector
  3. Correct usage of the Eigen::Ref class
  4. Convert Eigen Matrix to C array
  5. How could comma separated initialization such as in Eigen be possibly implemented in C++?
  6. typecasting Eigen::VectorXd to std::vector
  7. Apply function to all Eigen matrix element
  8. expected ‘}’ at end of input [closed]
  9. “unpacking” a tuple to call a matching function pointer
  10. Example for boost shared_mutex (multiple reads/one write)?
  11. shared_ptr to an array : should it be used?
  12. How much is too much with C++11 auto keyword?
  13. Why do I get the same sequence for every run with std::random_device with mingw gcc4.8.1?
  14. How to concatenate a std::string and an int
  15. What does std::match_results::size return?
  16. How to disassemble a binary executable in Linux to get the assembly code?
  17. How do I define a template function within a template class outside of the class definition?
  18. How to get list of files with a specific extension in a given folder?
  19. Division by zero: Undefined Behavior or Implementation Defined in C and/or C++?
  20. Performance of dynamic_cast?
  21. Beyond Stack Sampling: C++ Profilers
  22. C++ cout printing slowly
  23. Can I return in void function?
  24. Template typedefs – What’s your work around?
  25. Is NaN a valid key value for associative containers?
  26. Are there in x86 any instructions to accelerate SHA (SHA1/2/256/512) encoding?
  27. Constructor initialization Vs assignment
  28. Why does destructor disable generation of implicit move methods?
  29. Are the character digits [‘0’..’9′] required to have contiguous numeric values?
  30. C++ — How to overload operator+=?

Leave a Comment