Save values with AbstractAttribute.setValue

viktorious

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

Marco_Boeck

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