"How using NumericalMatrix in groovy"

Hello,

I've written a groovy script to calculate a new matix from an exampleSet.

import com.rapidminer.operator.visualization.dependencies.NumericalMatrix;
import Jama.Matrix;

ExampleSet exampleSet = operator.getInput(ExampleSet.class);

double[][] data = new double[exampleSet.size()][exampleSet.getAttributes().size()];
int r = 0;
numberOfColumns = exampleSet.getAttributes().size();

String[] columnNames = new String[numberOfColumns];
operator.logNote("nb col"+numberOfColumns);

for (Example example : exampleSet) {
	int c = 0;
	for (Attribute attribute : exampleSet.getAttributes()) {
		columnNames = attribute.getName();
		data = example.getValue(attribute);
		c++;
		}
	r++;
}
double[][] cooccMatrixEntries = new double[numberOfColumns][numberOfColumns];

for (int i = 0; i < cooccMatrixEntries.length; i++) {
	for (int j = i; j < cooccMatrixEntries.length; j++) {
		double cooc = getCooc(data, i, j);
		cooccMatrixEntries = cooc;
		cooccMatrixEntries = cooc;
	}
}

Matrix mcooc = new Matrix(cooccMatrixEntries);
NumericalMatrix nummat = NumericalMatrix("Cooc matrix",columnNames, mcooc, false);

return nummat;

and I've got the following error :
Process failed: The scripting engine Groovy reported an error in the script: groovy.lang.MissingMethodException: No signature of method: Script1.NumericalMatrix() is applicable for argument types: (java.lang.String, [Ljava.lang.String;, Jama.Matrix, java.lang.Boolean).

I don't understand why because I've included
import com.rapidminer.operator.visualization.dependencies.NumericalMatrix;

Thanks for your help.

Steph