How to define a matrix with each element a fixed size vector?

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  1. #1
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    How to define a matrix with each element a fixed size vector?

    Hi, how could I define a boost::ublas::matrix with each element a fixed size vector?

    I try to define it by
    Code:
    matrix< vector<double, 3> > double_matrix ;
    but get the following error:
    Code:
    main.cpp:18: error: template argument 1 is invalid
    main.cpp:18: error: template argument 3 is invalid
    main.cpp:18: error: expected unqualified-id before > token
    Actually, the following code doesn't work too, getting the same error:
    Code:
    matrix< vector<double> > double_matrix ;
    So, matrix doesn't support this type of declaration?

    Thanks!

  2. #2
    The superhaterodyne twomers's Avatar
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    >> with each element a fixed size vector?
    If it's fixed size why bother with a vector? Make a struct with three doubles, or a class and overload some operators if you want random access. eg:
    Code:
    #include <boost/numeric/ublas/matrix.hpp>
    
    struct my_doubles {
      double a, b, c;
    };
    
    int main() {
      boost::numeric::ublas::matrix<my_doubles> myd;
    
      return 0;
    }

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