[Paraview] [EXTERNAL] Re: Plot cumulative integral over time of a variable

[Scott, W Alan]

Thanks!

Are you going to get the patch into the next release?

Alan

From: Utkarsh Ayachit [mailto:utkarsh.ayachit at kitware.com]
Sent: Wednesday, July 15, 2015 9:06 AM
To: Scott, W Alan; paraview at paraview.org
Subject: [EXTERNAL] Re: [Paraview] Plot cumulative integral over time of a variable

Alan,

Attached is a state file (using can.ex2) which indeed uses numpy.trapz() to do the work. It needs a small patch to be applied to VTK (attached) to avoid a segfault.

The Programmable Filter adds a new row-data array named "trapz" which is the result of the operation (it's repeated so we can add it to RowData rather than field data.

Utkarsh
On Tue, Jul 14, 2015 at 7:23 PM Scott, W Alan <wascott at sandia.gov<mailto:wascott at sandia.gov>> wrote:
Question from a user:

I would like to use paraview to do the following:

1)      Integrate a nodal variable over a volume (IntegrateVariables filter does this)

2)      Then, integrate the result of the volume integral over time (cumulative integral)

The "IntegrateVariables" filter works just fine to integrate over the volume, and I can plot the results of it over time by selecting "RowData" from the "PlotSelectionOverTime" filter.  I just can't figure out how to do #2 - integrate these results over time with something like "numpy.trapz" or "scipy.integrate.cumtrapz".

I feel like this has probably been asked a million times, but I still seem to have trouble with it.  I think I usually fall back to other post processing tools.  Can this be done all in Paraview?



Thanks,

Alan


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