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Re: [ferret_users] Number of files

Hello Faisal,
Jaison offers some good suggestions. In Ferret versions 5.51 and later, we can have 100 datasets open at a time; before that version the limit was 30. If you are using a version of Ferret older than v5.51, upgrading to a more recent one will fix this. To see the version number, look at the lines that are output when you start Ferret.


Jaison Kurian wrote:
Hi Faisal,
The given details are not sufficient to suggest a better
solution to your problem. Anyway...making some wild guess gives
the following answers.

From the error messgae it seems to be NetCDF files. If your individual files are for same XYZ region and differs only in "time", then you have two options to do calculations involving all 40 files at the same time :

1. Using a Descriptor file --------------------------
This file ties all the specified NetCDF files into a single file along time axis. It is pretty easy to create one. Details about descriptor file
and its bounds are given in the User Manual at

Ch4 Sec4. FERRET PROGRAM LIMITS This will give basic ideas and an example for the descriptor file. You can also try serching in Mail Archive/FAQ for some usefull informations, especially for tools to make descriptor files. Also note that this is the ideal solution for files with considerable size.

2. Merging to a single NetCDF file
You can open the individual datasets in Ferret and can append data to a common output NetCDF file. Then you can use the new file for calcul-
ations. This process is very easy if you have proper time axis for each of the 40 NetCDF files. If it does not have one, then you have to
define a destination time axis and you have to assign the time axis to data from individual files before appending to the new file. This
method is not appreciable if the individual/combined file size is pretty large.

Try searching in the mail archives (http://ferret.pmel.noaa.gov/cgi-bin/marc-search.cgi) with key words like
"32 files" or "too many connects" to see previous mails discussing about
similar problem.
Which version of Ferret are you using ? According to the documentation
for Ferret version 6.00, the maximum number of data sets simultaneously open (as seen through SHOW DATA) is 100. I haven't checked this yet. So,
you can give try by switching to new versions....

If this mail/User Manual/Mail Archive/FAQ didn't help you to solve
your problem, write back with "ALL RELEVANT DETAILS".



On Tue, 28 Nov 2006, S. Faisal Saeed wrote:

Dear all,

It seems that ferret does open more than 33 files at a time. It gives an error of too many connects. I want to open 40 files and do some averaging, is there any simple solution ?



~> ~> ~> ~> ~> ~> ~> ~> ~> ~> ~>
Ansley Manke, NOAA/PMEL ansley.b.manke@noaa.gov
7600 Sand Point Way NE, Seattle WA
Phone 206-526-6246, FAX 206-526-6744

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