geopoints filter ( geopoints,geopoints )

A filter function to extract a subset of its geopoints input using a second geopoints as criteria. The two input geopoints must have the same number of values. The resulting output geopoints contains the values of the first geopoints where the value of the second geopoints is non-zero. It is usefully employed in conjunction with the comparison operators :

freeze

=

filter(temperature,temperature

<

273.15)

The

variable

freeze

will

contain

a

subset

of

temperature

where

the

value

is

below

273.15.