[Paraview] Plot cumulative integral over time of a variable

[Utkarsh Ayachit]

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> 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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