Instances newData = new Instances(exs);
newData.deleteWithMissingClass();
int numegs = newData.numInstances();
m_Dimension = newData.attribute(1).relation().numAttributes();
m_Attributes = newData.stringFreeStructure();
m_Change = new double[numegs][m_Dimension];
m_NumClasses = exs.numClasses();
m_Mean = new double[numegs][m_Dimension];
m_Variance = new double[numegs][m_Dimension];
m_Class = new double[numegs];