All,
After checking the documentation, the command is:
yes? use/regulart ~dataset_name~
There's no underscore in the qualifier.
-- Jon
Steve Hankin wrote:
Hi Jon,
a small P.S.:
Ferret has a qualifier USE/REGULAR_T (I think ...I'm offline at the moment)
that has the same effect as inserting the point-spacing='regular' attribute
on the T axis, but requires no change to the file.
- steve
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Jonathan Callahan wrote:
Jean-Marie,
This seems inordinately slow for Ferret. Especially for a file that is
only 1.5 Mb! When this happens it usually means that the time axis is
marked as 'irregular' which means that Ferret has to read in the entire
time axis before it can begin. We have found many cases where the axis
was actually 'regular' in spite of what the NetCDF attribute says. If
this is the case then you can use ncatted to change the time axis
attribute and Ferret should open this dataset much more quickly.
-- Jon
J-M Epitalon wrote:
hello,
I have daily simulation output covering the period 01-01-1950 to
31-12-2005. It is in a NetCDF file that is 1.5 Mb large.
When I access it through Ferret, it takes 2 to 4 mn to open it (execute
instruction "use").
I read in NCO documentation that "Some random access operations on large
files on certain architecture are slow when using the NetCDF interface".
That seems to be the problem. I could check that it is slow also with
other tools than ferret (Python, or NCO tools).
Anyway, what solution would you suggest to work around this ?
Is using MC descriptors a good idea?
Thanks
Jean-Marie Epitalon
CERFACS
Toulouse, France
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