Create vectors of vectors c++

typedef std::vector<std::vector<double> > Matrix;

Matrix matrix = { {0.1,1.1,.2},
                 {.4,.5,.6}, 
                 {.8,.9,.10}
                };
// Just initilization:
int rows = 3;
int cols = 3;
Matrix m3(rows, std::vector<double>(cols) );

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