Removes all non zeros */

Returns the explanation accumulated so far.

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

Convenient shorthand for making a jet.

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

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

Add an element to a group. If a group with this id does not exist, one is created. This method can be called any number of times for the same element.

\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 */

Access the parameter blocks for this residual. The array has size NumParameterBlocks().

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

Return a pointer to the block structure. We continue to hold ownership of the object though.

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

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

FIXME here we could return an expression of the sum