[almost solved] md5 or external function

The Execute Script-Operator may be what you are searching for.
One example you can see here.

Thanks a lot this is waaaaay cool

Now I just have to learn java lol

I was able to create my custom function, but the GUI shows an error trying to connect the output the next block (namely a "union"), what did I do wrong?

ExampleSet exampleSet = operator.getInput(ExampleSet.class);
for (Example example : exampleSet) {
example["attribute_test"] = "test";
}
return exampleSet;

Hi there,

You could try

example.setValue("attribute_test","test" )

.

Good luck.

Hi

That gives me the following error:

AM SEVERE: Process failed: The scripting engine Groovy reported an error in the script: groovy.lang.MissingMethodException: No signature of method: com.rapidminer.example.Example.setValue() is applicable for argument types: (java.lang.String, java.lang.String) values: [attribute_test, test]
Possible solutions: setValue(com.rapidminer.example.Attribute, java.lang.String), setValue(com.rapidminer.example.Attribute, double), getValue(com.rapidminer.example.Attribute), getClass(), values().

Using "equal" the script was working (the attribute is correctly filled), but the GUI doesn't accept the connection

I changed to

Attribute attr = example.getAttributes().get("attribute_test");
example.setValue(attr,"test" );

same behavior as with "equal", I guess I need to inform the GUI, don't I ?

No one has an idea? the process is working but the GUI states an error

Hi greg,

what do you mean with "the gui states an error" - do you mean a warning or an error in the Problems view of RapidMiner? Don't worry, these are *possible* problems, and in some cases RapidMiner is not able to get the correct meta data information and thus indicates a possible error/warning.

Best, Marius