[Paraview] Problem with numpy array

Wed Apr 18 15:13:40 EDT 2018

Hi Andy,

I haven’t verified, but at a glance it looks like what you are passing to the the LA.eig function is not a 2D numpy array. Can you try doing np.asarray(tensors) or 

from vtk.util.numpy_support import vtk_to_numpy
tensors = vtk_to_numpy(tensors)
and then pass that to LA.eig?

Kind regards,

Oscar

> On 18 Apr 2018, at 16:33, Cory Quammen <cory.quammen at kitware.com> wrote:
> 
> Hey Andy,
> 
> Does the GradientOfUnstructuredDataSet filter produce a tensor from an input vector field? My testing in ParaView indicates it doesn't , but I'm not super familiar with it.
> 
> Thanks,
> Cory
> 
> On Wed, Apr 18, 2018 at 11:14 AM, Caffagni, Andrea <Andrea.Caffagni at ferrari.com <mailto:Andrea.Caffagni at ferrari.com>> wrote:
> Dear Cory,
> 
> This is the complete message that I have obtained like output:
> 
>  
> 
> Traceback (most recent call last):
> 
> File "<string>", line 22, in <module>
> 
> File "<string>", line 14, in RequestData
> 
> File "C:\Program Files\ParaView 5.3.0-Qt5-OpenGL2-Windows-64bit\bin\lib\site-packages\numpy\linalg\linalg.py", line 1095, in eig
> 
> _assertRankAtLeast2(a)
> 
> File "C:\Program Files\ParaView 5.3.0-Qt5-OpenGL2-Windows-64bit\bin\lib\site-packages\numpy\linalg\linalg.py", line 202, in _assertRankAtLeast2
> 
> 'at least two-dimensional' % len(a.shape))
> 
> numpy.linalg.linalg.LinAlgError: 0-dimensional array given. Array must be at least two-dimensional
> 
> number of points 1
> 
> tensors[0:3] [VTKArray([[[ 8.34616375, -23.89611435, 2.00894117],
> 
> [ 0.67995167, -23.11237526, 289.07113647],
> 
> [ 27.26550674, -231.06710815, 16.90883636]]], dtype=float32)]
> 
>  
> 
>  
> 
> From this, I have thought about the vtk array.
> 
>  
> 
> Best regards,
> 
> Andrea
> 
>  
> 
> From: Cory Quammen [mailto:cory.quammen at kitware.com <mailto:cory.quammen at kitware.com>] 
> Sent: Wednesday, April 18, 2018 15:11
> To: Caffagni, Andrea
> Cc: paraview at public.kitware.com <mailto:paraview at public.kitware.com>
> Subject: Re: [Paraview] Problem with numpy array
> 
>  
> 
> Hi Andrea,
> 
>  
> 
> Besides the error message, what does your script print?
> 
>  
> 
> Thanks,
> 
> Cory
> 
>  
> 
>  
> 
> On Wed, Apr 18, 2018 at 2:14 AM, Caffagni, Andrea <Andrea.Caffagni at ferrari.com <mailto:Andrea.Caffagni at ferrari.com>> wrote:
> 
> Dear Users,
> 
> I need to solve an eigenproblem in a point of a CFD field.
> 
> Using the GradientOfUnstructuredDataSet I calculate the velocity gradient of my velocity field, than I isolate may point of interest and I have written the following ProgrammableFilter:
> 
>  
> 
> import numpy as np
> 
> from numpy import linalg as LA
> 
> from paraview import numpy_support
> 
> input = inputs[0]
> 
>  
> 
> numPoints = input.GetNumberOfPoints()
> 
> print "number of points",numPoints
> 
> tensors = input.PointData['Gradients']
> 
> print "tensors[0:3]",tensors[0:3]
> 
> eigenvalues,eigenvectors = LA.eig(tensors)
> 
> print 'eigenvalues', eigenvalues[0]
> 
> print 'eigenvectors',eigenvectors[0]
> 
> output.PointData.append(eigenvalues,'eigenvalues')
> 
> output.PointData.append(eigenvectors,'eigenvectors')
> 
>  
> 
> I have obtained the following error message:
> 
>  
> 
> Traceback (most recent call last):
> 
> File "<string>", line 22, in <module>
> 
> File "<string>", line 14, in RequestData
> 
> File "C:\Program Files\ParaView 5.3.0-Qt5-OpenGL2-Windows-64bit\bin\lib\site-packages\numpy\linalg\linalg.py", line 1095, in eig
> 
> _assertRankAtLeast2(a)
> 
> File "C:\Program Files\ParaView 5.3.0-Qt5-OpenGL2-Windows-64bit\bin\lib\site-packages\numpy\linalg\linalg.py", line 202, in _assertRankAtLeast2
> 
> 'at least two-dimensional' % len(a.shape))
> 
> numpy.linalg.linalg.LinAlgError: 0-dimensional array given. Array must be at least two-dimensional
> 
>  
> 
>  
> 
> I imagine that the problem is linked to the vtk array, I need to convert my ‘Gradients’ matrix in a nparray?
> 
> Someone have the same problem?
> 
>  
> 
> Best Regards,
> 
> Andrea
> 
>  
> 
>  
> 
> _________________________________________________________________________________________________________________
> 
>  
> 
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> 
>  
> 
> This message is intended only for the use of the addressee and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, or the employee or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is prohibited under the applicable data protection law. If you have received this e-mail by mistake, please notify us immediately by return e-mail and delete this e-mail and all attachments from your system.
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>  
> 
> _________________________________________________________________________________________________________________ 
> 
> 
> _______________________________________________
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>  
> 
> -- 
> 
> Cory Quammen
> Staff R&D Engineer
> Kitware, Inc.
> 
> _________________________________________________________________________________________________________________
> 
>  
> Questo messaggio è da intendersi esclusivamente ad uso del destinatario e può contenere informazioni che sono di natura privilegiata, confidenziale o non divulgabile secondo le leggi vigenti. Se il lettore del presente messaggio non è il destinatario designato, o il dipendente/agente responsabile per la consegna del messaggio al destinatario designato, si informa che ogni disseminazione, distribuzione o copiatura di questa comunicazione è vietata anche ai sensi della normativa vigente in materia di protezione dei dati personali. Se avete ricevuto questo messaggio per errore, vi preghiamo di notificarcelo immediatamente a mezzo e-mail di risposta e successivamente di procedere alla cancellazione di questa e-mail e relativi allegati dal vostro sistema.
> 
> _________________________________________________________________________________________________________________
> 
>  
> This message is intended only for the use of the addressee and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, or the employee or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is prohibited under the applicable data protection law. If you have received this e-mail by mistake, please notify us immediately by return e-mail and delete this e-mail and all attachments from your system.
> 
>  
> _________________________________________________________________________________________________________________ 
> 
> 
> 
> 
> -- 
> Cory Quammen
> Staff R&D Engineer
> Kitware, Inc.
> _______________________________________________
> Powered by www.kitware.com
> 
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
> 
> Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView
> 
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