Re: Nio Hangs With __setslice__ on Unlimited Dimension

Hi, Dave -

Sorry to take so long to get back to you. The problem no longer occurs
for me in the beta version either.

Thanks for the fix!
- Omer.

David Brown wrote:
> Hi Omer,
> I just wanted to let you know that I believe this problem has been fixed
> in the beta version of the new PyNIO release. It is
> now available on the ESG site. I would appreciate if you could try it
> out and report any problems you still have.
>
> -dave
>
> On Aug 13, 2008, at 11:21 AM, David Brown wrote:
>
>> Hi Omer,
>> Yes this does seem like a bug. I will try to fix it for the new release.
>> -dave
>>
>> On Aug 13, 2008, at 10:43 AM, Omer Bar-or wrote:
>>
>>> Hello,
>>>
>>> I am using Nio version 1.2.0 on 32-bit Debian 4.0 (Etch). (uname -a
>>> is at the bottom.)
>>>
>>> When setting a variable's data to an existing array, my understanding
>>> of the best practice (at least from Scientific.IO.NetCDF) is to do
>>> the following:
>>>
>>> var[:] = arr
>>>
>>> This practice works correctly when var is of a limited dimension, but
>>> if it is of the unlimited dimension, Nio hangs (at least for the
>>> twenty minutes or so that I let it run) and cannot be killed with
>>> ctrl-c or the TERM signal.
>>>
>>> The only solution I have found is to specify the ending index
>>> explicitly:
>>>
>>> var[:len(arr)] = arr
>>>
>>> Is this a bug? Is there a cleaner way to set an unlimited variable
>>> with a slice of data?
>>>
>>> An example script on which Nio hangs (virtually copied from the
>>> nio04.py example) is attached. Line 35 is the relevant line.
>>>
>>> Thanks,
>>> - Omer.
>>>
>>> P.S.
>>> > uname -a
>>> Linux laika 2.6.18-6-686 #1 SMP Sun Feb 10 22:11:31 UTC 2008 i686
>>> GNU/Linux
>>>
>>> import numpy
>>> import Nio
>>> import os
>>>
>>> #
>>> # Creating a NetCDF file named "nio04.nc". If there is already
>>> # a file with that name, delete it first.
>>> #
>>> filename = "nio04.nc"
>>>
>>> if (os.path.exists(filename)):
>>> os.remove(filename)
>>>
>>> #
>>> # Open a NetCDF file for writing file and specify a
>>> # global history attribute.
>>> #
>>> file = Nio.open_file(filename, "w")
>>> file.title = "Unlimited dimension test file"
>>>
>>> #
>>> # Create some dimensions.
>>> #
>>> file.create_dimension("time", None) # unlimited dimension
>>>
>>> print file
>>>
>>> #
>>> # Create a variable of type double with three dimemsions.
>>> #
>>> var = file.create_variable("var", 'd', ("time",))
>>> var._FillValue = -999.0
>>>
>>> data = numpy.arange(10)
>>> var[:] = data
>>>
>>> print "After assigning elements 0-9 of unlimited dimension:"
>>> print file
>>>
>>> print "Closing '" + filename + "' file...\n"
>>> file.close()
>>>
>>> _______________________________________________
>>> pyngl-talk mailing list
>>> pyngl-talk_at_ucar.edu
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>>
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Received on Wed Sep 03 2008 - 09:22:13 MDT