* \brief Set the number of rows and columns blocks */

\returns a view of the upper triangular matrix U */

\sa MatrixBase::coeff() * \warning the coordinates must fit into the referenced triangular part */

\sa MatrixBase::setIdentity() */

Return the best elapsed time in seconds */

\returns the value of the matrix at position \a i, \a j * This function returns Scalar(0) if the element is an explicit \em zero */

Preallocates \a reserveSize non zeros. * * Precondition: the matrix must be in compressed mode. */

\brief Give the number of rows. */

\brief Returns an expression of the tridiagonal matrix T in the decomposition * * \returns expression object representing the matrix T * *

FIXME here we could return an expression of the sum

\returns a const pointer to the array of inner indices. * This function is aimed at interoperability with other libraries. * \sa valuePtr(), out

\returns a const pointer to the array of values. * This function is aimed at interoperability with other libraries. * \sa innerIndexPtr(), outer