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### 10.7 Functions

Many functions are available for use within your expressions, covering standard mathematical and trigonometric functions, arithmetic utility functions, type conversions, and some more specialised astronomical ones. You can use them in just the way you'd expect, by using the function name (unlike column names, this is case-sensitive) followed by comma-separated arguments in brackets, so

        max(IMAG,JMAG)

will give you the larger of the values in the columns IMAG and JMAG, and so on.

The functions available for use by default are listed by class in the following subsections with their arguments and short descriptions. The `funcs` command provides another way to browse these function descriptions online.

- 10.7.1 Arithmetic
- 10.7.2 Arrays
- 10.7.3 Bits
- 10.7.4 Conversions
- 10.7.5 CoordsDegrees
- 10.7.6 CoordsRadians
- 10.7.7 Coverage
- 10.7.8 Distances
- 10.7.9 Fluxes
- 10.7.10 Formats
- 10.7.11 Gaia
- 10.7.12 Json
- 10.7.13 KCorrections
- 10.7.14 Lists
- 10.7.15 Maths
- 10.7.16 Randoms
- 10.7.17 Shapes
- 10.7.18 Sky
- 10.7.19 Strings
- 10.7.20 Tilings
- 10.7.21 Times
- 10.7.22 TrigDegrees
- 10.7.23 URLs
- 10.7.24 VO

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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