[ferret_users] unknown data set

[Marco van Hulten <mvhulten@xxxxxxxxxxxx>]

Hi fellow Ferretters,

Sometimes loaded datasets are not recognised by filename, and I get the
error message "unknown data set".  I am not able to make a minimal
working example that consistently reproduces this result.  It might be
related to files being in subdirectories and/or their names being
longer than a certain length, but I cannot be certain.

I first make a test file:

let aa = {1,2,3,4,5}
save/file=testfile aa

After that I exit Ferret, make a directory "sub", adjust my FER_DATA to
contain only . and sub, and put the file in there.  Furthermore, I make
some symlinks of different filename lengths.  I restart Ferret and
load several of the files (which are the same in the end):

yes? sh data testfile9ABCDEF0123456789ABC.nc
 **ERROR: unknown data set: 
yes? use testfile9ABCDEF0123456789A.nc
yes? sh data testfile9ABCDEF0123456789A.nc
     currently SET data sets:
    4> sub/testfile9ABCDEF0123456789A.nc  (default)
 name     title                             I         J         K         L         M         N
 AA       {1,2,3,4,5}                      1:5       ...       ...       ...       ...       ...
 
yes? use testfile9ABCDEF0123456789ABC.nc
yes? sh data testfile9ABCDEF0123456789ABC.nc
     currently SET data sets:
    6> sub/testfile9ABCDEF0123456789ABC.nc  (default)
 name     title                             I         J         K         L         M         N
 AA       {1,2,3,4,5}                      1:5       ...       ...       ...       ...       ...
 
yes? 

First I cannot approach testfile9ABCDEF0123456789ABC.nc, while after
opening/showing another one I *can*.  How could this be happening?

Just another quick observation, probably a side effect of allowing
short-hand writing in Ferret:

yes? sh data testfile9ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0.nc
     currently SET data sets:
    2> sub/testfile9ABCDEF0123456789ABCDEF0.nc
 name     title                             I         J         K         L         M         N
 AA       {1,2,3,4,5}                      1:5       ...       ...       ...       ...       ...

yes? sh data/brief
     currently SET data sets:
    1> sub/testfile9ABCDEF0123456789ABCDEF0123456789ABCDEF0.nc
    2> sub/testfile9ABCDEF0123456789ABCDEF0.nc
    3> sub/testfile9ABCDEF012345678.nc
    4> sub/testfile9ABCDEF0123456789A.nc
    5> sub/testfile9ABCDEF0123456789AB.nc
    6> sub/testfile9ABCDEF0123456789ABC.nc
    7> sub/testfile9ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0.nc  (default)

Marco

-- 
Laboratoire des Sciences du Climat et l'Environnement (LSCE)
Tel: +33 1 6908 3876
Www: http://www.lsce.ipsl.fr/Pisp/marco.van-hulten/

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