[Paraview] Calculator Filter -- Gradient

[DParker at chromalloy.com]

I have two somewhat related questions:

1. Is it possible to calculate a gradient vector using the calculator 
filter?

2. Is it possible to define a new data array using a Python script without 
the calculator filter? Currently, I am using several Calculator Filters to 
calculate CFD flow variables from the conservative variables. I use a 
Python script to create the Calculator Filters, but I'm wondering if I can 
avoid the Calculator Filter and directly generate new data arrays for 
plotting. 

David Parker
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