It would be extremely useful if Eigen supports sorting a matrix. Ideally (at least for me), it would have similar functionality as Matlab's sort function: [SortVal,SortInx] = sort(A, 2, 'descend') -Input matrix "A" -Matrix sort direction (rowwise/columnwise) -Sort ordering (descend/ascend) And returning: - SortVal is the sorted version of matrix A - SortInx are the corresponding indices.
Side question: Is it possible to build the Permutation matrix P (SortVal = P * A) from SortInx? If yes, how?
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