[Paraview] Calculator Filter -- Gradient

[Aurélien Marsan]

That's it.
In the Calculator, I would set the formula : Q1/Q4*iHat + Q2/Q4*jHat +
Q3/Q4*kHat.

In the programmable filter, there is some facilities in order to use numpy
arrays. But what should be the dimensions of the numpy array if we want to
add a vector by doing something like "block.PointData.append(array, 'newQ')"
?


Le 14 septembre 2010 17:15, Berk Geveci <berk.geveci at kitware.com> a écrit :

> I am not sure that I understand. Are Q1 and Q2 vectors? Are you trying
> to divide the component by component?
>
> 2010/9/13 Aurélien Marsan <aur.marsan at gmail.com>:
> > Hello,
> >
> > In order to calculate a new scalar (here for a multiblockdataset)
> >
> > pdi = self.GetInput()
> >
> > pdo = self.GetOutput()
> >
> > pdo.ShallowCopy(pdi)
> >
> > for block in output[0]:
> >
> > if block.GetNumberOfPoints() != 0:
> >
> > array = block.PointData['Q1'] / block.PointData['Q2']
> >
> > block.PointData.append(array, 'newQ')
> >
> > For a new vector, I would like someone to explain a simple way to do
> that.
> > (without many transpose, ravel, etc...)
> > Knowing that it does not work with array =
> > numpy.array([block.PointData['Q1'], block.PointData['Q2'],
> > block.PointData['Q3']]) / block.PointData['Q4']
> > because of a problem of dimensions.
> >
> > Regards,
> >
> > A.Marsan
> >
> > 2010/9/10 <DParker at chromalloy.com>
> >>
> >> I have a couple of questions about using the Programmable Filter. I have
> >> imported Tecplot dataset with the following data: coordsX, coordsY,
> coordsZ,
> >> Q1, Q2, Q3, Q4, Q5.
> >>
> >> How would I create a new data array that is Q2^2+Q3^2+Q4^2?
> >>
> >> How would I create a new vector data array (similar to
> >> Q2*iHat+Q3*jHat+Q4*kHat in the Calculator Filter)?
> >>
> >>
> >>
> >>
> >> From:        David E DeMarle <dave.demarle at kitware.com>
> >> To:        DParker at chromalloy.com
> >> Cc:        paraview at paraview.org
> >> Date:        09/10/2010 01:24 PM
> >> Subject:        Re: [Paraview] Calculator Filter -- Gradient
> >> Sent by:        paraview-bounces at paraview.org
> >> ________________________________
> >>
> >>
> >> On Fri, Sep 10, 2010 at 1:10 PM,  <DParker at chromalloy.com> wrote:
> >> > I have two somewhat related questions:
> >> >
> >> > 1. Is it possible to calculate a gradient vector using the calculator
> >> > filter?
> >>
> >> No. The calculator filter does only element wise (cell by cell or
> >> point by point) computations. To compute the gradient you need
> >> information from neighboring elements.
> >>
> >> >
> >> > 2. Is it possible to define a new data array using a Python script
> >> > without
> >> > the calculator filter? Currently, I am using several Calculator
> Filters
> >> > to
> >> > calculate CFD flow variables from the conservative variables. I use a
> >> > Python
> >> > script to create the Calculator Filters, but I'm wondering if I can
> >> > avoid
> >> > the Calculator Filter and directly generate new data arrays for
> >> > plotting.
> >> >
> >>
> >> Not with a python script (under the python shell) since that runs on
> >> the client and can't really manipulate the data (which lives on the
> >> server) directly. However, the python programmable filter runs on the
> >> server, and with that you can create new arrays, and access
> >> neighboring elements as well.
> >> See http://www.paraview.org/Wiki/Python_Programmable_Filter for
> examples.
> >>
> >> > David Parker
> >> > _______________________________________________
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> >> >
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> >
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