\returns the stored value at index \a key * If the value does not exist, then the value \a defaultValue is returned without any insertion. */

\returns A const reference to the vectors containing the beta values * * This vector permits to reconstruct the j-th eigenvalues as alphas

\internal performs the LU decomposition in-place of the matrix represented * by the variables \a rows, \a cols, \a lu_data, and \a lu_stride using

2nd arg is so bolt<M, false> always works

\returns \c true if the iterator \c *this still references a valid coefficient.

block size, number of dimensions of each vector

\returns the center of the box */

The index type defined by EIGEN_DEFAULT_DENSE_INDEX_TYPE must be a signed type. This dummy function simply aims at checking that at compile time.