Dear Utkarsh, After some more googling and your answer I found the solution. Indeed I have to store the data as a string in the Programmable Filter and then retrieve with GetValue in the Python Annoatation. My ProgrammableFilter with Ouput set to vtkData is now
import sys sys.path.append("C://Apps/Anaconda/Anaconda2/envs/paraview/Lib/site-packages/") import netCDF4 as nc t = inputs[0].GetInformation().Get(vtk.vtkDataObject.DATA_TIME_STEP()) date_time = nc.num2date(t, units="hours since 0001-01-01 00:00:00", calendar="gregorian") outputarray = vtk.vtkStringArray() outputarray.SetName("datetime") outputarray.SetNumberOfTuples(1) outputarray.SetValue(0, "{}".format(date_time)) print("{} -> {}".format(t, date_time)) output.RowData.AddArray(outputarray) and after that I add a PythonAnnotation with Row Data as Array Association and the following expression "{}".format(input.RowData["datetime"].GetValue(0)) It is not very trivial I must say, but the result is now that I can plot a date/time string in stead of a float with number of hourse since. Excellent! Thanks for your quick help Regards Eelco Ps: for those interessed in using netcdf4 with paraview: you have to make sure to get all the versions correct. I did this by using Anaconda and than create a special paraview environment conda create -n paraview python=2.7.3 netcdf4 activate paraview conda install numpy=1.8.1 2017-06-06 17:05 GMT+02:00 Utkarsh Ayachit <utkarsh.ayac...@kitware.com>: > Array Association: Row Data >> Expression: "{}".format(input.RowData) >> But this gives me just a reference to the row data, not the string of the >> date/time I just stored >> > > Try using `input.RowData["datatime"].GetValue(0)` instead. String arrays > are a little cumbersome currently. You have to use the vtkAbstractArray API > (GetValue) to access elements. > > Utkarsh > > >
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