tf.idf problem

Hey guys,

Within Rapidminer I set up a process to compute tf.idf-values for certain words of a text corpus. The problem is whenever i try to use "tf.idf" as vector creation method, all I get as a result is "term frequency" values (also I double checked the values choosing "term frequency" as vector creation method; so it really is term frequency).

When i am not using my word list, but choose to compute tf.idf-values for every single word within the text corpus, results seem to be tf.idf-values. But I really want to calculate tf.idf-values only for specific words (included in my special word list).

Does anyone have a idea how to solve this problem?

Kind regards,

Philipp