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# Generate cdd `.ext` / `.ine` file format

`sage.geometry.polyhedron.cdd_file_format.``cdd_Hrepresentation`(cdd_type, ieqs, eqns)

  Return a string containing the H-representation in cddlib’s ine format.

  EXAMPLES:

      sage: from sage.geometry.polyhedron.cdd_file_format import cdd_Hrepresentation
      sage: cdd_Hrepresentation('rational', None, [[0,1]])
      'H-representation\nlinearity 1 1\nbegin\n 1 2 rational\n 0 1\nend\n'

`sage.geometry.polyhedron.cdd_file_format.``cdd_Vrepresentation`(cdd_type, vertices, rays, lines)

  Return a string containing the V-representation in cddlib’s ext format.

  NOTE:

  If there is no vertex given, then the origin will be implicitly added. You cannot write the empty V-representation (which cdd would refuse to process).

  EXAMPLES:

      sage: from sage.geometry.polyhedron.cdd_file_format import cdd_Vrepresentation
      sage: print cdd_Vrepresentation('rational', [[0,0]], [[1,0]], [[0,1]])
      V-representation
      linearity 1 1
      begin
        3 3 rational
        0 0 1
        0 1 0
        1 0 0
      end

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