[ferret_users] FERRET v5.81: return=xaxis needs huge memory

[Martin Schmidt <martin.schmidt@xxxxxxxxxxxxxxxxx>]

Hi all,
I am confronted with the following:

I am computing specific humidity from dew point temperature.
Trying to cancel the modulo flag of the output data, ferret
complains about missing memory.

To demonstrate the problem, I have written some test
procedure from public files:

use etopo60

define axis/t=0:3000:1/t0=1-jan-2000/unit=days tax
define grid/x=rose[d=1]/y=rose[d=1]/t=tax tg
let tatm = rose + 0*t[gt=tg]

sp rm tatm*
repeat/l=1:3000 save/file=tatm.nc/append tatm
q

Now restart ferret

use tatm.nc
let ahumi = 1
let a1 = 6.1078
let a2 = 17.2693882
let a3 = 0.01
let a4 = 237.29
let pvapour = ahumi*a1*exp(a2*(tatm-a3)/(tatm+a4))
can axis/modulo `pvapour,return=xaxis`
 **ERROR: insufficient memory: 194400000 words were requested.

I only wanted to change an axis attribute .... 
 
Surprisingly the following helps:
set region/l=1
can axis/modulo `pvapour,return=xaxis`
can region 

Also the following works
let pvapour = 1*exp(2*(tatm-3)/(tatm+4))
yes? can axis/modulo `pvapour,return=xaxis`
 !-> can axis/modulo ETOPO60X

Something is wrong here, which I consider worth to be reported.

Best,
Martin Schmidt