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typedef Eigen::Matrix<uint8_t, Dynamic, Dynamic> MatrixXuint8;
MatrixXuint8 tmp(2, 3);
tmp << 51, 52, 53, 54, 55, 56;
cout << "tmp is: " << dec << tmp << endl;


This code, which creates a matrix of unsigned bytes, prints it as ASCII:

tmp is: 3 4 5
6 7 8

I thought the `dec` would instruct Eigen/C++ to give me a decimal interpretation of the values but no luck. I don't see anything in IOFormat that'll control this aspect of the printout. How can I get this to print out numbers the way MatrixXi would?

std::dec does not change how char are printed, regardless of Eigen. So as a workaround you have to cast it like: cout << tmp.cast<short>()