Set operations
~~~~~~~~~~~~~~


+ `intersect`_ returns the vector of common values of two vectors
+ `setdiff`_ returns components of a vector which do not belong to
  another one
+ `union`_ extract union components of a vector
+ `unique`_ extract unique components of a vector or matrices


.. _union: union.html
.. _setdiff: setdiff.html
.. _intersect: intersect.html
.. _unique: unique.html