[Paraview] find minimum on a slice using interpolated values

[Cory Quammen]

Andrea,

Are your mesh cells linear (and hence linear interpolation would be used)?
If so, then the minimum will always be at a mesh point. If they are higher
order elements, then indeed the minimum could be somewhere inside a cell.
Others on the list may be able to tell you if there is a way to find this
minimum point in VTK.

Best regards,
Cory

On Thu, May 3, 2018 at 4:13 AM Caffagni, Andrea <Andrea.Caffagni at ferrari.com>
wrote:

> Thank you Mathieu for your suggestion,
>
> But if I understand correctly with this method I’m able to find only the
> value on the mesh points.
>
> Thus, if I change the mesh with finer or coarser elements the value and
> the location that I can find change.
>
> I would like to avoid this behavior, for this reason I would get the
> minimum value using the interpolated value on the slice.
>
> do you think it's possible to do it? can I manage this with a programmable
> filter (work from script without gui)?
>
>
>
> Best Regards,
>
> Andrea
>
>
>
> *From:* Mathieu Westphal [mailto:mathieu.westphal at kitware.com]
> *Sent:* Thursday, May 03, 2018 09:07
> *To:* Caffagni, Andrea
> *Cc:* paraview at public.kitware.com
> *Subject:* Re: [Paraview] find minimum on a slice using interpolated
> values
>
>
>
> Hi Andrea,
>
> If your are using ParaView, you can obtain this information quite easilly
> by showing your dataset in a Spreadsheet view and orderinng the data by
> "Pressure".
>
>
>
> Best,
>
>
> Mathieu Westphal
>
>
>
> On Wed, May 2, 2018 at 8:57 PM, Caffagni, Andrea <
> Andrea.Caffagni at ferrari.com> wrote:
>
> Dear users,
>
> I need to find the absolute minimum value on a slice of a certain scalar
> (like pressure).
>
> I would get this point using the interpolation in order to avoid the
> ‘sensitivity’ to the mesh (in this way, theoretically, if I change the mesh
> the minimum should always remain at the same point).
>
> For this point I would like to get the three-dimensional position and the
> value of the scalar in question (pressure and/or velocity), maybe I can use
> the numpy functions in a programmable filter?
>
>
>
> https://docs.scipy.org/doc/numpy-1.14.0/reference/generated/numpy.amin.html
>
>
>
> But I have not idea of how use the interpolation…
>
>
>
> Thanks for the suggestions,
>
> Andrea
>
>
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-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.
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