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[ferret_users] average beyond time axis limit



Dear Ferreters,

I wonder if anyone can reproduce the behaviour that when I average a variable beyond its time axis limit in time, I get a non-invalid, rather than invalid field. Here is an reproducible example:

$ ferret -nojnl
     NOAA/PMEL TMAP
     FERRET v6.4
     Linux(g77) 2.6.9-89.ELsmp - 11/30/09
      5-Aug-10 14:23

yes? use monthly_navy_winds.cdf
yes? show data
     currently SET data sets:
1> /home/dwang/software/ferret/fer_dsets/data/monthly_navy_winds.cdf (default)
 name     title                             I         J         K         L
UWND ZONAL WIND 1:144 1:73 ... 1:132 VWND MERIDIONAL WIND 1:144 1:73 ... 1:132

yes? shade uwnd[l=133]
 **ERROR: illegal limits: UWND does not exist at L=133
          Axis extremes are L=1:132
!!! Ferret correctly points out l=133 is out of axis limit.

yes? shade uwnd[l=133:144@ave]
!!! Ferret shows a map. But l=133:144 is out of axis limit! The time axis is not a modulo axis.

This is Ferret 6.4 on a 64-bit Linux box.

Thanks,
David

--
Daiwei Wang
Department of Earth and Environmental Sciences and
Lamont-Doherty Earth Observatory
Columbia University



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