Removes all non zeros */

The following is needed for std::complex<Real>:

Length of sequence

Wait for reference count to become one, and set reference count to zero. Works on tasks while waiting. */

------------------------------------------------------------------------ End of signatures required by parallel_reduce -------------------------------

< \brief Returns the length of the Householder sequence. */

Return the best elapsed time in seconds */

\sa MatrixBase::setIdentity() */

Swaps the content of two sparse matrices of the same type. * This is a fast operation that simply swaps the underlying pointers and parameters.

Sanitize docstrings and add custom failure explanation

returns 1 if success, 0 if failure ==> nothing done*/