Re: Creating a relational Attribute for Multi Instance Data

> I am trying to create an Instances object in Java, which will contain
> multi instance data.
>
> If you run the code below, then you will see a
> "java.lang.IndexOutOfBoundsException: Index -1 out of bounds for length
> 0", which is thrown from the last line in the try-block (where
> toString() is called on "rawData").
>
> However, if I define the attribute "bag" as a string attribute (instead
> of relational), then everything works great. So I think I must have made
> some mistake in the way I am creating the relational attribute.

Have a look at this example on the wiki, which demonstrates how to
create and fill a relational attribute:
https://waikato.github.io/weka-wiki/formats_and_processing/creating_arff_file/

Cheers, Peter
-- 
Peter Reutemann
Dept. of Computer Science
University of Waikato, Hamilton, NZ
Mobile +64 22 190 2375
https://www.cs.waikato.ac.nz/~fracpete/
http://www.data-mining.co.nz/
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