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"How using NumericalMatrix in groovy"

sjasja Member Posts: 2 Contributor I
edited May 2019 in Help

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);
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.




  • steffensteffen Member Posts: 347  Maven
    Hello Steph

    Finally a meaningful precise problem description Β ;D

    My attempt to run the script failed because the method getCooc(...) was not available. So here is only a guess regarding your error:
    The word "new" is missing in the third-last line, hence the interpreter "thinks" that NumericalMatrix is the name of a method instead of a constructor.

    hope this was helpful,

  • sjasja Member Posts: 2 Contributor I

    thanks for your help,

    It works now and it was a very stupid error.

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