[vtkusers] Fwd: Problems with vtkDoubleArray

[Ronald Römer]

Hello Susanne,

the problem is simple. Don't use InsertNextTupleValue in conjunction with
SetNumberOfTuples (or SetNumberOfValues). The following code will work:

vtkDoubleArray *measurements = vtkDoubleArray::New();
//measurements->SetNumberOfComponents(1);

measurements->SetNumberOfValues(numberOfGridpoints);
measurements->SetName(name);

for (int i = 0; i < numberOfGridpoints; i++) {
    double temp = static_cast<double>(measurementArray[i][t]);
    cout << "temp: " << temp << endl;
    measurements->SetValue(i, temp);

    double check = measurements->GetValue(i);
    cout << "check: " << check << endl;
}

meshPolyData->GetPointData()->AddArray(measurements);

Best regards (from Germany).


On Mon, Jan 13, 2014 at 11:26 AM, Susanne Schmalkalt <
Susanne.Schmalkalt at gmx.de> wrote:

> Hallo everybody,
>
> I have a question regarding vtkDoubleArray.
>
> I want to save doubles in an array which I then add to a PolyDataObject.
> But when I add the variable and then call it again, the correct value
> dissapears.
> Does someone have an idea why? what am I doing wrong?
>
>
>         Instantiate(measurements,vtkDoubleArray);
>         measurements->SetNumberOfComponents(1);
>         measurements->SetNumberOfTuples(numberOfGridpoints);
>         measurements->SetName(name);
>         for(int i = 0; i < numberOfGridpoints; i++){
>             double temp[1];
>             temp[0] = static_cast<double>(measurementArray[i][t]);
>             cout << " temp: " << temp[0];
>             measurements->InsertNextTupleValue(temp);
>             vtkIdType id = (vtkIdType)i;
>             double check[1];
>             measurements->GetTupleValue(id,check);
>             cout << " check: " << check[0];
>         }
>         meshPolyData->GetPointData()->AddArray(measurements);
>
> Thank you for your help!
> Susi
>
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