Short example : MatrixXd mat(10,10); double * a = mat.data(); // OK double * b = mat.diagonal().data(); // The method data() does not exist
If it is the diagonal of a direct access type, this should be solved directly by solving bug 58. (And for non direct access the data() function would not make sense.) As a first workaround, one could Matrix<...>::diagonal() return a strided map.
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