And the above errors about 1d array and 2d array also happens when I run example at http://www.vtk.org/Wiki/VTK/Examples/Cxx/Utilities/vtkPCAStatistics too. Wenlong -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20111025/7e322f4c/attachment.htm>