[Paraview] Computation of gradients fails

[Martin Vymazal]

Hello Ken,

  I computed the x-velocity component using a calculator filter. Then  
I applied the 'Gradient of Unstructured Data Set' filter to the output  
of the previous filter. This is the place where the computation fails.  
I sent you the data in a private email.

Best regards,

  Martin Vymazal


Quoting "Moreland, Kenneth" <kmorel at sandia.gov>:

> More information please.
>
> How are you extracting the x-component of the velocity?  What filter  
> are you running to compute the gradient?  Would it be possible to  
> post some example data that exhibits the problem so that we can  
> replicate it?
>
> -Ken
>
>
> On 9/22/10 7:12 AM, "Martin Vymazal" <martin.vymazal at vki.ac.be> wrote:
>
> Dear ParaView developers,
>
>   I'm trying to compute gradient of my x-component of velocity on a
> grid of tetrahedra which has 55244 DOF. ParaView fails to compute the
> gradients with the following error message:
>
> Generic Warning: In
> /home/kitware/Dashboard/MyTests/ParaView-3-8/ParaView-3.8/ParaView/VTK/Common/vtkMath.cxx,  
> line
> 1338
> Unable to factor linear system
>
> The mesh does not have degenerate/ugly elements, but it has some sharp
> edges (in the inlet/outlet area). Is this a problem? If not, is there
> a way of avoiding the error?
>
> Thank you very much.
>
>   Martin Vymazal
>
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>    ****      Kenneth Moreland
>     ***      Sandia National Laboratories
> ***********
> *** *** ***  email: kmorel at sandia.gov
> **  ***  **  phone: (505) 844-8919
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