[Paraview] How to get array member data in python shell or programmable filter in paraview?

[Mei Chen]

Hi,

I use GradientOfUnstructuredDataSet to get Gradients. I can see the
Gradients_0, ..., Gradients_8 on the Scalars part if I add a new Calculator
filter after the GradientOfUnstructuredDataSet filter. My question is how
to get these Gradients_0, ..., Gradients_8 in Python Shell or Programmable
Filter? I would like to do some data process with them.

I tried to get by this way:
reader = GetActiveSource()
gradientsAll = reader.PointData.GetArray(1) # suppose the Gradients is the
second variables in the data list
gradientsAll.GetRange(0) # I can see the range of the 9 gradient scalars
but I cannot access the data

I want to create a Jacobi matrix of these 9 gradients to calculate other
support matrix and the eigenvalues (for example, to get the Lambda2
criterion). I also need the number of points. I check the proxy but have no
idea which function can be used.
Any suggestion or example of codes will be very appreciated!


Thanks,
Mei Chen
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