recursive definitions

["'Jeff Polton'" <swp98jap@xxxxxxxxxxxxxxxxx>]

Dear Ferreteers,
	I'm struggling trying to define a variable which is the sum of a
number of others:

potemp = temp1 + temp2 + temp3 + ... + temp20

Ferret doesn't like recursive loops:
REPEAT/K=1:20 (potemp = temp`K` + potemp)

And there are too many data sets to be entering them each time by hand.
Does anybody know of a way around this?

Thanks in advance,
	Jeff Polton
________________________________________________________________________
  Dept of Meteorology,Reading University,Earley Gate,Reading. RG6 6BB
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