[ferret_users] arithmetics not working on a variable (broken netCDF file?)

[Ryo Furue <furue@xxxxxxxxxx>]

Hi Ferret users,

I seem to have created a strange netCDF file:

  http://iprc.soest.hawaii.edu/~furue/tmp/tmp.nc

with which you can plot the variable

  shade/k=1/l=1 tdmb

but not if you do some arithmetics with it

  shade/k=1/l=1 tdmb*10
 **ERROR: dimensions improperly specified: must be a 2D region
          shade/k=1/l=1 tdmb*10

If you define a new variable

  let a = tdmb*10

that can be plotted.  I'm attaching a complete listing below.

There must be something "interesting" about the file,
but I don't know what it is.

Regards,
Ryo
====================================
$ ferret
        NOAA/PMEL TMAP
        FERRET v6.2
        Linux(g77) 2.4.21-32 - 05/19/09
        25-Aug-09 15:49

set mode grat:dash
set memory/size=400
 Cached data cleared from memory
keymark 1
yes? set data tmp.nc
 *** NOTE: Ignored modulo length exceeding axis length: lont
 *** NOTE: Ignored modulo length exceeding axis length: lonv
 *** NOTE: Evenly spaced axis has edges definition: dept - ignored
yes? show data
     currently SET data sets:
    1> ./tmp.nc  (default)
 name     title                             I         J         K         L
 TDMB                                      1:1       1:100     1:40      1:1

yes? shade/k=1/l=1 tdmb
yes? shade/k=1/l=1 tdmb*10
 **ERROR: dimensions improperly specified: must be a 2D region
          shade/k=1/l=1 tdmb*10
yes? let a = tdmb*10
yes? shade/k=1/l=1 a
yes?