Hi Carlo,
That's right — some special characters cause errors because they are interpreted as mathematical symbols in your formula!
no need to extract though. A couple solutions:
- (maybe) quoting the metric might work (this should work with the Artifact API and maybe quoting twice would work on the CLI, e.g., "'metric'")
- (definitely works) use
qiime feature-table group
to rename your metric(s) in the feature table, instead of extracting to manually rename.
Here's how to relabel (just apply to the feature axis instead of sample axis):