[vtkusers] Python vtkPointData Help!

[Charles O'Connor]

Dear VTK users,

 I am new to VTK and trying to get my data read into its format. I have 
prepared my data as a VTK data array by doing the following:

-------------------------------------------------------------
aa = vtk.vtkFloatArray()
aa.SetNumberOfValues( nxx * nyy )
aa.SetName( 'pcmdiqnt' )
k = 0
for j in range( 0, nyy ):
  for i in range( 0, nxx ):
     aa.SetValue( k, vv[j,i] )
     k = k + 1

bb = vtk.vtkPointData()
bb.AddArray( aa )
print 'debug PointData IsArrayAnAttribute', bb.IsArrayAnAttribute( 0 )
print 'debug bb PointData array 0 name = ', bb.GetArrayName( 0 )
print 'debug bb PointData array count = ', bb.GetNumberOfArrays( )
----------------------------------------------------------

This produces the output:
debug PointData IsArrayAnAttribute -1
debug bb PointData array 0 name =  pcmdiqnt
debug bb PointData array count =  1

This knows the array name (i.e., "pcmdiqnt") and the number of array is 
1. This is correct, but the "IsArrayAnAttibute" returns a -1. This is 
wrong. Why?

What I am ultimately after is:

pp = vtk.vtkPoints()
pp.SetNumberOfPoints( nxx * nyy )
k = 0
for j in range( 0, nyy ):
  for i in range( 0, nxx ):
     pp.SetPoint( k, xx[i], yy[j], 0.0 )
     k = k + 1

ss = vtk.vtkStructuredGrid()
ss.SetDimensions( nxx, nyy, 1 )
ss.SetPoints( pp )
ss.SetFieldData( bb )
ss.Update()
ss.UpdateData()

Can someone help me to get a vtk.vtkStructuredGrid() so I can plot my data?

Thanks in advance and best regards,
   Charles O'Connor