Re: [Nio] assigning to a string/char NetCDF variable does not work

From: David Brown <dbrown_at_nyahnyahspammersnyahnyah>
Date: Thu Jul 14 2011 - 18:19:57 MDT

Hi Michael,
Sorry for the delay, but I have finally been able to take a look at this problem. The issue is simply that the assignment must specify equal numbers of characters on both the left and right sides or
you get a dimensional mismatch. The simplest approach, that seems to work with all versions of numpy and PyNIO that I have tried is to subscript the file variable on the left using the length
of the string. You cannot use the assign_variable method because it does not allow for subscripting.

I am attaching a modified version of your original script that illustrates how this works.

On Jun 16, 2011, at 3:09 AM, Michael Decker wrote:

> Hi everyone,
> I just noticed I don't manage to assign a string value to a non-scalar
> string/char-typed variable in a NetCDF file using Nio. I could not find
> any documentation on assignment of string values to NetCDF variables on
> the Nio webpages but I am relatively sure that it has already worked
> some time ago. (I can't be absolutely certain about that, though).
> Assigning a string of len 1 to a scalar char variable works as expected
> in straight-forward notation.
> I attached a small script that reproduces the problem on our system
> (Debian GNU/Linux stable). We're using Nio 1.4.0, which is the newest
> version as far as I can tell.
> I have tried a few alternative ways I thought might work (see commented
> lines) without any luck. Does anyone have an idea how it could work or
> if this is a bug in Nio?
> Regards,
> Michael
> --
> Michael Decker
> Forschungszentrum Jülich
> Institut für Energie- und Klimaforschung - Troposphäre (IEK-8)
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Received on Thu Jul 14 18:20:02 2011

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