Creating new attributes / Custom Example Set

cherokee

Hi!

I'm currently writing my own bunch of operators. One task would be to create a new attribute. I tried to copy this process from AttributeConstruction / ExpressionParser. Anyhow it doesn't work. When running my operator in RapidMiner I get the error "ArrayIndexOutOfBoundsException occured in 1st application of Add Point Mapping (Add Point Mapping)".

I'm using this code (minimal example):

public IOObject[] apply() throws OperatorException {
		PointExampleSet exampleSet = getInput(PointExampleSet.class);

		Attribute xAttr = AttributeFactory.createAttribute("x1", Ontology.REAL);
		exampleSet.getExampleTable().addAttribute(xAttr);
		exampleSet.getAttributes().addRegular(xAttr);

		for (Example example : exampleSet) {
			example.setValue(xAttr, 0);
		}
  return new IOObject[]{exampleSet};
}

For my project I had to extend ExampleSet, but I didn't override any method. What am I doing wrong?

[Edit:] As workaround I gave AttributeConstruction. I came up with the same error. So the problem seems to be in my Custom ExampleSet. But I haven't overridden anything there. *confused*.

I've written an Reader that creates my PointExampleSet from file(s). Therefore I'm using a MemoryExampleTable.

Best regards,
Michael

cherokee

Here is the code for my Source Operator without logging:

public IOObject[] apply() throws OperatorException {
		File sourceDir = getParameterAsFile("directory_to_load_from");
		File[] allFiles = sourceDir.listFiles();

		Pattern filePattern = Pattern.compile(getParameterAsString("only_files"));

		MemoryExampleTable data = new MemoryExampleTable(new ArrayList<Attribute> ());
		data.addAttribute(AttributeFactory.createAttribute("id", Ontology.STRING));

		int maxPoints = 0;
		for (File source : allFiles) {
			if (filePattern.matcher(source.getName()).matches()) {
				maxPoints = Math.max(maxPoints, addPTSData(data, source));
			} 
		}

		PointExampleSet exSet = new PointExampleSet(data);
		// addPoint mappings
		int pointMaximum = -1;
		String shapeName = "point";
		int shapeNameIndex = -1;
		int sequentialNumber = 0;
		String xSuffix = getParameterAsString("x_value_suffix");
		String ySuffix = getParameterAsString("y_value_suffix");
		List<String[]> shapeNames = getParameterList("shape_names");

		for	(int pointNo = 0; pointNo<maxPoints;pointNo++) {	
			// check if attribute is present iff not create it

                        if (sequentialNumber >= pointMaximum) {
				shapeNameIndex++;
				if (shapeNameIndex >= shapeNames.size()) {
					shapeNameIndex = shapeNames.size() - 1;
				} else {
					shapeName = shapeNames.get(shapeNameIndex)[0];
					pointMaximum = Integer.parseInt(shapeNames
							.get(shapeNameIndex)[1]);
					sequentialNumber = 0;
				}
			}
			String nextPointName = shapeName + sequentialNumber++;
			Attribute xAttr = data.findAttribute(nextPointName+xSuffix);
			Attribute yAttr = data.findAttribute(nextPointName+ySuffix);

			exSet.addPointMapping(nextPointName, xAttr, yAttr);
		} 



		return new IOObject[]{exSet};
	}