Extended Operations for Nominal Values

This process shows examples for the extended operations for nominal values coming with one of the next RapidMiner updates (5.0.011 or 5.1.000). The operations are performed with the operator "Generate Attributes" and can be used directly within the expressions for the new attributes.

The supported functions include Number to String [str(x)], String to Number [parse(text)], Substring [cut(text, start, length)], Concatenation [concat(text1, text2, text3...)], Replace [replace(text, what, by)], Replace All [replaceAll(text, what, by)], To lower case [lower(text)], To upper case [upper(text)], First position of string in text [index(text, string)], Length [length(text)], Character at position pos in text [char(text, pos)], Compare [compare(text1, text2)], Contains string in text [contains(text, string)], Equals [equals(text1, text2)], Starts with string [starts(text, string)], Ends with string [ends(text, string)], Matches with regular expression exp [matches(text, exp)], Suffix of length [suffix(text, length)], Prefix of length [prefix(text, length)], Trim (remove leading and trailing whitespace) [trim(text)].