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#### 6.1.13 `every`

Usage:

       every [-exact|-approx] <step>

Include only every `<step>`'th row in the result, starting with the first row. The optional `-approx`/`-exact` argument controls whether the selection needs to be exact; in some cases an approximate calculation can take advantage of parallelism where an exact one cannot.

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STILTS - Starlink Tables Infrastructure Library Tool Set
Starlink User Note256
STILTS web page: http://www.starlink.ac.uk/stilts/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@jiscmail.ac.uk