Creating Memory ExampleSet

Jacksonhi

Hi,

I am reading an SQL table to create an ExampleSet and also trying to create a matching ExampleSet in memory.

First a question about the sql generated set.

System.out.println(exampleSet.toResultString()); Attributes tributes = exampleSet.getAttributes(); System.out.println(tributes.toString());

When I run this on my SQL generated ExampleSet I see in 4.6

SimpleExampleSet:
59 examples,
8 regular attributes,
special attributes = {
    label = #9: RNK (nominal/single_value)/values=[A, B, C, D, E]
    id = #8: inc (integer/single_value)
}
SimpleAttributes: sl3, sl5, sl8, sl13, sl21, mvv, hl, mvp, label := RNK, id := inc


Where did the id come from? I manipulated the id so that it became the sql key by  adding inc and by placing it next to the label. Before I did this, the double mvp was not a regular expression, it seemed to be left out, becoming id. Could this be a bug?

This is my Memory Example set that has a null pointer exception.

SimpleExampleSet:
59 examples,
8 regular attributes,
special attributes = {
    label = #8: RNK (nominal/single_value)/values=[A, B, C, D, E]
}
SimpleAttributes: sl3, sl5, sl8, sl13, sl21, mvv, hl, mvp, label := RNK

land

Hi,
how did you create the exampleset resulting from the sql query? Did you use the DatabaseExamplesetSource? Please provide the process or code fragment where the exampleset is created. Otherwise I can't see your parameter settings...

The same applies to the second question. Without having the stack trace, the fragment creating the exampleset and the lines, where the null pointer exception occurs, I cannot give you any reasonable advise.

Greetings,
  Sebastian