I don't the reason of the expression error.

limingliming Member Posts: 13 Contributor I
edited August 2019 in Help
The process XML "test5.xml" is below. The corresponding picture are as following, 

When I run the process, I encounter an error as following,

How to fix the error

Best Answer

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    limingliming Member Posts: 13 Contributor I
    Solution Accepted
    Choose "Insert and evaluate" in "Insert macro". The corresponding is as following,


  • Options
    MartinLiebigMartinLiebig Administrator, Moderator, Employee, RapidMiner Certified Analyst, RapidMiner Certified Expert, University Professor Posts: 3,517 RM Data Scientist
    to quickly explain it: Macros are by default Strings. This means:
    id < %{outlier} 
    is a comparison between a string and an integer, which does not work.
    Evaluate allows you to interpret the string. In your case, it gets parsed and thus works. Interestingly you can also do things like
    id < eval("sqrt("+%{outlier}+")")
    which makes eval super strong.

    - Sr. Director Data Solutions, Altair RapidMiner -
    Dortmund, Germany
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