Re: recursive definitions

[Jonathan Callahan <callahan@xxxxxxxxxxxxx>]

Jeff,

To do this you need to use string symbols.  The REPEAT/K=1:20 changes
the context (which K slice) for each iteration.  You cannot use K as if
it were a regular variable.  It is a "pseudo variable" with special
properties.

But the following does work:

yes? let a1 = 1
yes? let a2 = 2
yes? let a3 = 3
yes? let a4 = 4
yes? repeat/l=1:4 go repeat_test
             1
          1.000
             2
          2.000
             3
          3.000
             4
          4.000

Where the contents of repeat_test.jnl are:

  ! repeat_test.jnl
  !
  define symbol num = `l`
  list a($num)
  ! end


-- Jonathan Callahan


'Jeff Polton' wrote:
> 
> 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
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>   Dept of Meteorology,Reading University,Earley Gate,Reading. RG6 6BB
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