SimpleAttribute instead of Attribute in Rapidminer script?

Question

I am trying to extract an Attribute from an ExampleSet in a RapidMiner 'Execute script' like this:

ExampleSet exSet = input[0]; 
Attributes attrs = exSet.getAttributes(); 
Attribute attr = attrs.getAttribute("h_area"); 

but then I get an error and it says that attrs is not a Attributes but a SimpleAttributes object.

This works:

Attribute[] attrs2 = exSet.createRegularAttributeArray(); 
Attribute attr2 = attrs2.getAt(1);

What is the correct way to get an Attribute from an ExampleSet?

Answer 1

From these docs, it looks like the getAttributes() call will return an object implementing the Attributes abstract class, which SimpleAttributes is, so it looks pretty fair at this stage. However, the getAttribute() method doesn't look like it's defined in either object. I can't test this here and now, but have you tried the following:

ExampleSet exSet = input[0]; 
Attributes attrs = exSet.getAttributes(); 
Attribute attr = attrs.get("h_area");