[vtkusers] about vtkPCAAnalysisFilter in vtk 6.1.0

[Bill Lorensen]

What errors do you get when you try this with vtk6?

On Tue, Apr 15, 2014 at 5:08 AM, Waldo Valenzuela
<waldo.valenzuela at hotmail.com> wrote:
> Hey Guys,
>
> I am migrating my code from vtk 5.1.0 to vtk 6.1.0 and I have my first problem. I am doing statistical shape modelling using vtkPCAAnalysisFilter, but I don’t know how configure in vtk 6 this filter. Here I have a example how I was using before.
>
> // ===============================================================
> shapeVariations variable is a vector with vtkpolydata, different meshes already aligned.
>  // do PCA
>         vtkSmartPointer<vtkPCAAnalysisFilter> pca;
>         pca = vtkSmartPointer<vtkPCAAnalysisFilter>::New();
>
>         pca->SetNumberOfInputs( numberOfShapeVariations );
>
>         for (int i = 0; i < numberOfShapeVariations; i++){
>                 pca->SetInput(i, shapeVariations[i]);
>         }
>
>         std::cout<<"Start PCA"<<std::endl;
>         pca->Update();
>         std::cout<<"Finished PCA"<<std::endl;
>
>
>         numberOfModes = shapeVariations.size();
>
>         //setEigenValues
>
>         eigenValues.clear();
>
>         vtkSmartPointer<vtkFloatArray> evals = vtkSmartPointer<vtkFloatArray>::New();
>         evals = pca->GetEvals();
>
> // reading eigen values
>         for(int i = 0; i < evals->GetNumberOfTuples(); i++)
>         {
>                 float value = evals->GetTuple1(i);
>         }
>
>
>         //reading EigenVectors
>
>
>         for (int i = 0; i < numberOfModes; i++){
>                 vtkPointSet* evecs = pca->GetOutput(i);
>         }
> // ===============================================================
> Someone know some example of this filter for vtk 6.1.0?
>
> I will really appreciate any help on this subject.
>
> Best regards,
>
> Waldo
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