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Save values with AbstractAttribute.setValue

viktoriousviktorious Member Posts: 4 image Contributor I
edited November 2018 in Help
Hey I need again some help,

i have some difficulties to understand the documentation.
i want simply to save some values in a column.
I the doc there is an example with "for (Example example : exampleSet) {...."
But i want (of course) to set some single values.
I have tried with for AbstractAttribute.setValue..without success. Can help anyone?
Thx in advance!
-Vik
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Answers

  • Marco_BoeckMarco_Boeck Administrator, Moderator, Employee-RapidMiner, Member, University Professor Posts: 1,996 image RM Engineering
    Hi,

    you need the example and the attribute you want to change the value of. 
    Attribute attribute = exampleSet.getAttributes().get("nameOfAttribute")
    to get the attribute 
    example.setValue(attribute, 85.0d);
    or 
    example.setValue(attribute, "hello world!");
    to change the value.

    An alternative would be to create an ExampleSet yourself from scratch, however that's probably not what you need ;)
    MemoryExampleTable table = new MemoryExampleTable(listOfAttributes); // a list with Attributes
    // example of how to fill the double array
    doubleArray = new double[listOfAttributes.size()];
    // nominal attribute
    Attribute attNominal = listOfAttributes.get(0);
    doubleArray[0] = attNominal.getMapping().mapString("hello world!");
    // numerical attribute
    Attribute attNumerical = listOfAttributes.get(1);
    doubleArray[1] = 85.0d;
    table.addDataRow(new DoubleArrayDataRow(doubleArray)); // doubleArray is a double array with as many entries as the table has attributes
    ExampleSet exampleSet = table.createExampleSet();
    Regards,
    Marco
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