Fileiterator

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Dear all,

I have a set of examples made of several arff file in a directory. I would like to load all those files. I have found the “FileIterator” Meta Operator but didn’t manage to have it work. Does anyone has examples of how to use it or how to do this kind of tasks?
Thank you

land

Hi,
here it comes how it works. It's a little bit tricky, because you have to use some "dirty" operators like the ExceptionHandling, but nevertheless, it's quite easy if you know how to do it:

<operator name="Root" class="Process" expanded="yes">
    <operator name="FileIterator" class="FileIterator" expanded="yes">
        <parameter key="directory"	value="C:\Test"/>
        <parameter key="filter"	value=".*arff"/>
        <operator name="ExceptionHandling" class="ExceptionHandling" expanded="yes">
            <operator name="IORetriever" class="IORetriever">
                <parameter key="name"	value="ES"/>
                <parameter key="io_object"	value="ExampleSet"/>
            </operator>
        </operator>
        <operator name="ArffExampleSource" class="ArffExampleSource">
            <parameter key="data_file"	value="%{file_path}"/>
        </operator>
        <operator name="ExampleSetMerge" class="ExampleSetMerge">
        </operator>
        <operator name="IOStorer" class="IOStorer">
            <parameter key="name"	value="ES"/>
            <parameter key="io_object"	value="ExampleSet"/>
        </operator>
    </operator>
    <operator name="IORetriever (2)" class="IORetriever">
        <parameter key="name"	value="ES"/>
        <parameter key="io_object"	value="ExampleSet"/>
    </operator>
</operator>

And I assume, with RapidMiner 5.0 it will be much easier...

Greetings,
  Sebastian

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Thank you very much Sebastian, this is brilliant!!