Resizes the matrix to a \a rows x \a cols matrix and initializes it to zero * \sa resizeNonZeros(Index), reserve(), setZero() */

Return the best elapsed time in seconds */

\sa MatrixBase::setIdentity() */

\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 */

\returns a const pointer to the array of the starting positions of the inner vectors. * This function is aimed at interoperability with other li

\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 values. * This function is aimed at interoperability with other libraries. * \sa innerIndexPtr(),

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

the memset function

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