[Paraview] numpy_interface/dataset_adapter append method fails on string datatypes ?

[Utkarsh Ayachit]

Dean,

Current numpy support in VTK doesn't include string arrays, You can
overcome that as follows:

colNames = [ 'simulation', 'v0 (m/s)', 'k (%)' ]
col0     = [ 'm01-sim001', 'm01-sim002', 'm02-sim001' ]
...
strArray = vtk.vtkStringArray()
strArray.SetName(colNames[0])
strArray.SetNumberOfTuples(len(col0))
for i in range(len(col0)):
    strArray.SetValue(i, col0[i])
output.RowData.AddArray(strArray)




On Fri, Jul 1, 2016 at 9:46 PM, Dean Neumann <dwneumann at gmail.com> wrote:

> I am trying to write a python programmable filter which calculates
> statistics across multiple input datasets and outputs those as a vtkTable.
>
> All is ok for numeric values.   But I can't seem to get any approach to
> work for outputting a vtkTable column of string values.
> Using numpy_interface/dataset_adapter.py is the cleanest approach I've yet
> tried for appending  columns of numeric values to an output dataset of type
> vtkTable, but it raises the following error on string-valued arrays:
>
>> Traceback (most recent call last):
>
> File "<string>", line 29, in <module>
>
> File "<string>", line 14, in RequestData
>
> File "C:\Program
>> Files\ParaView\lib\paraview-5.0\site-packages\vtk\numpy_interface\dataset_adapter.py",
>> line 648, in append
>
> narray = narray * numpy.ones(arrLength)
>
> TypeError: only integer arrays with one element can be converted to an
>> index
>
>
> Can someone please post an example python programmable filter that outputs
> a vtkTable which includes a column of string valued data?   I have attached
> a minimal script which reproduces the problem.
>
>
> Thanks....
>
> Dean Neumann
>
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