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I don't the reason of the expression error.
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Optionsliming Member Posts: 13 Contributor IChoose "Insert and evaluate" in "Insert macro". The corresponding is as following,
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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.
Best,
Martin
Dortmund, Germany