Re: Array assignment issue

Hi Zach,

Your 'foo' variable is created using the default NumPy float type,
float64, which is a 'double' in NetCDF and
PyNIO. On the other hand you create 'var_NC' as type 'f' which is a
NetCDF 'float', equivalent to float32
in NumPy. Make the var_NC type 'd', or make foo into a float32.

There seems to be some type conversion going on when single elements
are assigned. I am not quite sure what
is up with that. I think the loop code in the script should not work
either. I will investigate.
  -dave

On Sep 10, 2008, at 3:47 PM, Zach DuFran wrote:

> I am trying to assign values from a 2-d array of floats to a netcdf
> variable of the same dimensions and dimension size. Whenever I try
> to do the assignment in one line, I get the following error:
>
> NIOError: type or dimensional mismatch writing to variable (foo_bar)
>
> Traceback (most recent call last):
>
> File "reassign.py”, line 33, in <module>
>
> var_NC[:,:] = foo[:,:]
>
> SystemError: error return without exception set
>
>
>
> However, if I assign the data inside 2 loops, it works (albeit very
> slowly for large arrays). The attached script illustrates the
> problem, as well as the alternative method which works. Why won’t
> the quicker method of one line assignment work?
>
>
>
> I am running Python v. 2.5.2 and PyNgl v. 1.2.0 on Linux i686.
>
>
>
> Thanks for the help-
>
> Zach DuFran
>
> <reassign.py>
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Received on Wed Sep 10 2008 - 16:33:05 MDT