[Insight-users] MeanCalculator

[Buerger, Corinna (ext)]

Hi all, 
 
I want to use the itk::Statistics::MeanCalculator.
The following lines are a code snippet of mine. 
 
// start code snippet
MeanCalculatorType::Pointer meanCalculator = MeanCalculatorType::New();
meanCalculator->SetInputSample( dataSample );
meanCalculator->Update();
std::cout << "size of data sample: " << dataSample->Size() << std::endl;
// outputs 3 (which is correct)
std::cout << "size of mean: " << meanCalculator->GetOutput()->GetSize()
<< std::endl;                // outputs 0 (why???)
// end code snippet
 
dataSample is earlier defined as:
typedef itk::VariableLengthVector< double > DataType;
typedef itk::Statistics::ListSample< DataType > DataSampleType;
DataSampleType::Pointer dataSample;
 
Why do I get no output from the MeanCalculator?
Any help is appreciated.
 
Regards, 
 
Corinna
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