Is there any convenient syntax in Eigen for creating a matrix by concatenating several other matrices? That is, if A, B, and C are 3x3, and I would like to create the 9x3 matrix D=[A;B;C] (matlab notation), is there an "Eigeny" way to do this? (Obviously it could be done with a loop...) Thank you!

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MatrixXf D(9, 3);
D << A, B, C;


Note that 9x3 means 9 rows so the matrices will be stacked on top of each other.