# File easy_vtk.rb, line 1307
    def to_va
      case typecode
      when NArray::BYTE
        vary = Vtk::UnsignedCharArray.new
      when NArray::SINT
        vary = Vtk::ShortArray.new
      when NArray::INT
        vary = Vtk::IntArray.new
      when NArray::SFLOAT
        vary = Vtk::FloatArray.new
      when NArray::FLOAT
        vary = Vtk::DoubleArray.new
      else
        raise "NArray type is invalid"
      end
      case rank
      when 1
        vary.SetNumberOfValues( length )
        for i in 0...length
          vary.SetValue( i, self[i] )
        end
      when 2
        numTuple, numComp = shape
        vary.SetNumberOfComponents( numComp )
        vary.SetNumberOfTuples( numTuple )
        for i in 0...numTuple
          for j in 0...numComp
            vary.SetComponent( i, j, self[i,j] )
          end
        end
      else
        raise "NArray rank must be 1 or 2: rank=#{rank}"
      end
      return vary
    end