heights = 30 to 50

tall_heights = '= filter(heights, > 40)'

The result would return a subsection of the samples, just those that are greater than 40.

This seems a bit tricky because it may lead to conditions where there are no samples. One option for implementation would be to replace the 'filtered-out' samples with a variable like 'NaN' that our system would realize it shouldn't do math on. This means that the analysis mode would still work.