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bug?



Dear Ferret users

When trying to calculate pdf's, I found a very strange behaviour of ferret? What I tried 
to do is regrid a 2D-dataset on a 1D-vector in order to be able to sort the data.


I tried the following and got an error message (I don't understand):

yes? DEFINE AXIS/X=1:1681:1 tot_x  ! subset of the 2D-region with 1681 grid-pts
yes? LET tot_grd = X[GX=tot_x]
yes? LET on1ax = RESHAPE(TEMP[D=1,I=10:50,J=10:50,L=15], tot_grd)
yes? 
yes? list on1ax
 **ERROR: regridding: Axis orientation not matching request:GX=TOT_X
yes? 


However, when I changed the name of the newly defined x-axis from tot_x to xax and the 
name of the newly defined grid from tot_grd to grd1d, it worked:

yes? DEFINE AXIS/X=1:1681:1 xax ! subset of the 2D-region with 1681 grid-pts
yes? LET grd1d = X[GX=xax]
yes? LET on1ax = RESHAPE(TEMP[D=1,I=10:50,J=10:50,L=15], grd1d)
yes? 
yes? list on1ax
             RESHAPE(TEMP[D=out.small-pres.surf1,I=10:50,J=10:50,L=15], GRD1D)
 1      /    1:  294.3
 2      /    2:  294.3
 3      /    3:  294.3
 4      /    4:  294.3
 5      /    5:  294.2
  
 
The more, the first syntax worked when I used a z-axis (==> name: tot_z) and a 
corresponding grid (==> name tot_grd). So it can't only be the underscore.

Although I finally sorted out the problem, is there anything I didn't understand 
correctly or is it just a bug? Are there any letters one can't use in naming variables 
and grids?

Thanks,
Nick 

_____________________________________________________________

Nicolas Schneider
PhD Student
University of Bern
Institute of Geography
Climatology & Meteorology
Hallerstrasse 12
CH-3012 Bern

phone +41-31-631-8542
fax   +41-31-631-8511
email schneid@giub.unibe.ch
_____________________________________________________________



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