data from vtk to python












0














So this should be a fast question to answer. I am parsing a *vtk file with a python script.



In this line I obtain a certain field like temperature:



field = vtk_to_numpy(data.GetPointData().GetArray("Temperature"))


straight after i want to obtain another field like nodal conductivity:



kappa = vtk_to_numpy(data.GetPointData().GetArray("Heat.conductivity"))


everything works ok for the temperature field, but for the conductivity field i get the following message:



kappa = vtk_to_numpy(data.GetPointData().GetArray("Heat.conductivity"))
File "~anaconda3/lib/python3.6/site-packages/vtk/util/numpy_support.py", line 215, in vtk_to_numpy
typ = vtk_array.GetDataType()
AttributeError: 'NoneType' object has no attribute 'GetDataType'


Can someone explain why it works for the temperature field, and not for the conductivity?










share|improve this question






















  • The fact that it's saying a NoneType is being operated on makes me think that it's exiting out of one of the Get functions early. Are you sure "Heat.conductivity" is the right name of the field? I would check with GetNumberOfArrays() and GetArrayName to make sure the fields you expect to see actually exist.
    – ahota
    Nov 21 '18 at 21:58










  • The field Heat.conductivity is included in the *.vtk file. is there any way to say "get fields number one and two"????? @ahota
    – Andres Valdez
    Nov 22 '18 at 16:50










  • Yes, there's also a GetArray signature that takes an integer index: vtk.org/doc/nightly/html/…. It says it's not recommended (they prefer the polymorphic version), but it's still worth a try.
    – ahota
    Nov 22 '18 at 16:55
















0














So this should be a fast question to answer. I am parsing a *vtk file with a python script.



In this line I obtain a certain field like temperature:



field = vtk_to_numpy(data.GetPointData().GetArray("Temperature"))


straight after i want to obtain another field like nodal conductivity:



kappa = vtk_to_numpy(data.GetPointData().GetArray("Heat.conductivity"))


everything works ok for the temperature field, but for the conductivity field i get the following message:



kappa = vtk_to_numpy(data.GetPointData().GetArray("Heat.conductivity"))
File "~anaconda3/lib/python3.6/site-packages/vtk/util/numpy_support.py", line 215, in vtk_to_numpy
typ = vtk_array.GetDataType()
AttributeError: 'NoneType' object has no attribute 'GetDataType'


Can someone explain why it works for the temperature field, and not for the conductivity?










share|improve this question






















  • The fact that it's saying a NoneType is being operated on makes me think that it's exiting out of one of the Get functions early. Are you sure "Heat.conductivity" is the right name of the field? I would check with GetNumberOfArrays() and GetArrayName to make sure the fields you expect to see actually exist.
    – ahota
    Nov 21 '18 at 21:58










  • The field Heat.conductivity is included in the *.vtk file. is there any way to say "get fields number one and two"????? @ahota
    – Andres Valdez
    Nov 22 '18 at 16:50










  • Yes, there's also a GetArray signature that takes an integer index: vtk.org/doc/nightly/html/…. It says it's not recommended (they prefer the polymorphic version), but it's still worth a try.
    – ahota
    Nov 22 '18 at 16:55














0












0








0







So this should be a fast question to answer. I am parsing a *vtk file with a python script.



In this line I obtain a certain field like temperature:



field = vtk_to_numpy(data.GetPointData().GetArray("Temperature"))


straight after i want to obtain another field like nodal conductivity:



kappa = vtk_to_numpy(data.GetPointData().GetArray("Heat.conductivity"))


everything works ok for the temperature field, but for the conductivity field i get the following message:



kappa = vtk_to_numpy(data.GetPointData().GetArray("Heat.conductivity"))
File "~anaconda3/lib/python3.6/site-packages/vtk/util/numpy_support.py", line 215, in vtk_to_numpy
typ = vtk_array.GetDataType()
AttributeError: 'NoneType' object has no attribute 'GetDataType'


Can someone explain why it works for the temperature field, and not for the conductivity?










share|improve this question













So this should be a fast question to answer. I am parsing a *vtk file with a python script.



In this line I obtain a certain field like temperature:



field = vtk_to_numpy(data.GetPointData().GetArray("Temperature"))


straight after i want to obtain another field like nodal conductivity:



kappa = vtk_to_numpy(data.GetPointData().GetArray("Heat.conductivity"))


everything works ok for the temperature field, but for the conductivity field i get the following message:



kappa = vtk_to_numpy(data.GetPointData().GetArray("Heat.conductivity"))
File "~anaconda3/lib/python3.6/site-packages/vtk/util/numpy_support.py", line 215, in vtk_to_numpy
typ = vtk_array.GetDataType()
AttributeError: 'NoneType' object has no attribute 'GetDataType'


Can someone explain why it works for the temperature field, and not for the conductivity?







python vtk






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 21 '18 at 20:03









Andres ValdezAndres Valdez

537




537












  • The fact that it's saying a NoneType is being operated on makes me think that it's exiting out of one of the Get functions early. Are you sure "Heat.conductivity" is the right name of the field? I would check with GetNumberOfArrays() and GetArrayName to make sure the fields you expect to see actually exist.
    – ahota
    Nov 21 '18 at 21:58










  • The field Heat.conductivity is included in the *.vtk file. is there any way to say "get fields number one and two"????? @ahota
    – Andres Valdez
    Nov 22 '18 at 16:50










  • Yes, there's also a GetArray signature that takes an integer index: vtk.org/doc/nightly/html/…. It says it's not recommended (they prefer the polymorphic version), but it's still worth a try.
    – ahota
    Nov 22 '18 at 16:55


















  • The fact that it's saying a NoneType is being operated on makes me think that it's exiting out of one of the Get functions early. Are you sure "Heat.conductivity" is the right name of the field? I would check with GetNumberOfArrays() and GetArrayName to make sure the fields you expect to see actually exist.
    – ahota
    Nov 21 '18 at 21:58










  • The field Heat.conductivity is included in the *.vtk file. is there any way to say "get fields number one and two"????? @ahota
    – Andres Valdez
    Nov 22 '18 at 16:50










  • Yes, there's also a GetArray signature that takes an integer index: vtk.org/doc/nightly/html/…. It says it's not recommended (they prefer the polymorphic version), but it's still worth a try.
    – ahota
    Nov 22 '18 at 16:55
















The fact that it's saying a NoneType is being operated on makes me think that it's exiting out of one of the Get functions early. Are you sure "Heat.conductivity" is the right name of the field? I would check with GetNumberOfArrays() and GetArrayName to make sure the fields you expect to see actually exist.
– ahota
Nov 21 '18 at 21:58




The fact that it's saying a NoneType is being operated on makes me think that it's exiting out of one of the Get functions early. Are you sure "Heat.conductivity" is the right name of the field? I would check with GetNumberOfArrays() and GetArrayName to make sure the fields you expect to see actually exist.
– ahota
Nov 21 '18 at 21:58












The field Heat.conductivity is included in the *.vtk file. is there any way to say "get fields number one and two"????? @ahota
– Andres Valdez
Nov 22 '18 at 16:50




The field Heat.conductivity is included in the *.vtk file. is there any way to say "get fields number one and two"????? @ahota
– Andres Valdez
Nov 22 '18 at 16:50












Yes, there's also a GetArray signature that takes an integer index: vtk.org/doc/nightly/html/…. It says it's not recommended (they prefer the polymorphic version), but it's still worth a try.
– ahota
Nov 22 '18 at 16:55




Yes, there's also a GetArray signature that takes an integer index: vtk.org/doc/nightly/html/…. It says it's not recommended (they prefer the polymorphic version), but it's still worth a try.
– ahota
Nov 22 '18 at 16:55












1 Answer
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oldest

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So after surfing on the web I found he next flag I was supposed to turn on while reading the *.vtk file,



reader.ReadAllScalarsOn()


Now everything works as planned.






share|improve this answer





















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    1 Answer
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    active

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    1 Answer
    1






    active

    oldest

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    active

    oldest

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    active

    oldest

    votes









    0














    So after surfing on the web I found he next flag I was supposed to turn on while reading the *.vtk file,



    reader.ReadAllScalarsOn()


    Now everything works as planned.






    share|improve this answer


























      0














      So after surfing on the web I found he next flag I was supposed to turn on while reading the *.vtk file,



      reader.ReadAllScalarsOn()


      Now everything works as planned.






      share|improve this answer
























        0












        0








        0






        So after surfing on the web I found he next flag I was supposed to turn on while reading the *.vtk file,



        reader.ReadAllScalarsOn()


        Now everything works as planned.






        share|improve this answer












        So after surfing on the web I found he next flag I was supposed to turn on while reading the *.vtk file,



        reader.ReadAllScalarsOn()


        Now everything works as planned.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 23 '18 at 21:11









        Andres ValdezAndres Valdez

        537




        537






























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