[Paraview] Fwd: [Catalyst] Extracting and saving data from a spreadsheet

[Utkarsh Ayachit]

Attached is a script that demonstrates how to do this. I suspect you're
putting your code in `CreatePipeline`. As the name  suggests, it's only
called when creating pipeline the first time, and not on every iteration.
I've modified a ParaView test script. Modifications are in `### START
MODIFICATION ###` and `### END MODIFICATION ###` blocks. You can run this
as follows:

> bin/pvbatch -sym -dr
 <ParaViewSource>/CoProcessing/PythonCatalyst/Testing/Cxx/waveletdriver.py
/tmp/cptest.py 10

Utkarsh
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