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

[Utkarsh Ayachit]

Yes, the change is already merged in VTK. It'll make it to ParaView soon.

Utkarsh

On Wed, Jul 15, 2015 at 12:38 PM Scott, W Alan <wascott at sandia.gov> wrote:

>  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> 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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