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1) Q is always square 2) Q*R*P' is valid and recovers the original matrix This implies that the size of Q is the number of rows in the original matrix, square, and that the size of R is the size of the original matrix.
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
For more information go to http://eigen.tuxfamily.org/.
For pull request please only use the official repository at https://bitbucket.org/eigen/eigen.
For bug reports and feature requests go to http://eigen.tuxfamily.org/bz.
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