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You're getting the error because you haven't defined a variable named <code>soundings</code>. If you define this variable by <pre><code>soundings = f.dimensions[u'soundings'] </code></pre> then you should be able to find the length of <code>soundings</code> using <code>print len(soundings)</code>. Alternatively, you can access the length of the 'soundings' dimension directly by using <pre><code>print len(f.dimensions[u'soundings']) </code></pre> I have to admit, I've not used netCDF4, so I read the <a href="http://netcdf4-python.googlecode.com/svn/trunk/docs/netCDF4-module.html" rel="nofollow">netCDF4 documentation</a> briefly. In the section 'Dimensions in a netCDF file' it contains the following example of displaying the dimensions of a netCDF4 dataset: <pre class="lang-none prettyprint-override"><code>>>> print rootgrp.dimensions OrderedDict([('level', <netCDF4.Dimension object at 0x1b48030>), ('time', <netCDF4.Dimension object at 0x1b481c0>), ('lat', <netCDF4.Dimension object at 0x1b480f8>), ('lon', <netCDF4.Dimension object at 0x1b48a08>)]) </code></pre> (For brevity, I've omitted the details about where <code>rootgrp</code> comes from.) The next line of code in the following code fragment is this: <pre class="lang-none prettyprint-override"><code>>>> print len(lon) </code></pre> What you might have missed is that the variable <code>lon</code> was declared further up, as <pre class="lang-none prettyprint-override"><code>>>> lon = rootgrp.createDimension('lon', 144) </code></pre> The above section of tutorial deals with creating new dimensions in a netCDF file, whereas you are reading existing dimensions from a netCDF file. You must therefore fetch the dimensions out of the netCDF file.
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1. POTrouble handling a NetCDF4 file
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1. COThanks for your help. I went through the netCDF documentation for more than one hour, found the above given example but could not understand it. As you assumed totally correct I just was not able to realize that one step in the code is missing. Now I know what to do. Thanks.
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