Method prune

external/eigen/Eigen/src/SparseCore/SparseMatrix.h:636–639

Suppresses all nonzeros which are \b much \b smaller \b than \a reference under the tolerance \a epsilon */

    /** Suppresses all nonzeros which are \b much \b smaller \b than \a reference under the tolerance \a epsilon */
    void prune(const Scalar& reference, const RealScalar& epsilon = NumTraits<RealScalar>::dummy_precision())
    {
      prune(default_prunning_func(reference,epsilon));
    }
    
    /** Turns the matrix into compressed format, and suppresses all nonzeros which do not satisfy the predicate \a keep.
      * The functor type \a KeepFunc must implement the following function: