Mike Bauer wrote:
> Eric,
>
> Thanks for the reply. I'm trying to show the relative 2d distribuion
> between 2 sets of data. I thought the normalization would ease the
> comparison. Fixing the ' doesn't help.
>
> So are you saying I need an instance of something.normalize rather than
> just passing norm='normalize'?
It sounds like you are misunderstanding the norm kwarg; it is for
controlling the mapping of an arbitrary range of numbers to the 0-1
range that is used in color mapping. The default is a linear mapping;
one can use a log mapping instead ("norm=colors.LogNorm()"), or make
your own mapping function, etc. The norm kwarg takes an instance of a
Normalize class or subclass. See colors.py to find out what Normalize
subclasses are available. But, you may not need to specify one at all,
depending on what it is you are trying to do.
I still don't understand what it is that you wanted to "normalize".
What was the undesirable characteristic of the plot you had before you
put in the norm kwarg?
Eric
>
> Mike
>
> Sent from my iPhone
>
> On Mar 20, 2009, at 5:15 PM, Eric Firing <efir...@hawaii.edu> wrote:
>
>> Mike Bauer wrote:
>>> Hello,
>>> Quick note. I'm making plots with hexbin and everything works
>>> correctly until I try to use the norm='Normalize' option at which
>>> point I get:
>>> Traceback (most recent call last):
>>> File "diff_engine_v2tmp.py", line 731, in <module>
>>> kept_and_discards)
>>> File "diff_engine_v2tmp.py", line 605, in main
>>> plt.hexbin(xdat,ydat,cmap=cm.jet,gridsize=25,norm=Normalize' )
>>
>> What is that single quote mark doing after Normalize? If we ignore
>> it, then it looks like you are passing a class, not a class instance
>> as the kwarg needs.
>>
>>> File "/opt/local/Library/Frameworks/Python.framework/Versions/2.5/
>>> lib/python2.5/site-packages/matplotlib/pyplot.py", line 1920, in hexbin
>>> ret = gca().hexbin(*args, **kwargs)
>>> File "/opt/local/Library/Frameworks/Python.framework/Versions/2.5/
>>> lib/python2.5/site-packages/matplotlib/axes.py", line 5452, in hexbin
>>> collection.autoscale_None()
>>> File "/opt/local/Library/Frameworks/Python.framework/Versions/2.5/
>>> lib/python2.5/site-packages/matplotlib/cm.py", line 148, in
>>> autoscale_None
>>> self.norm.autoscale_None(self._A)
>>> AttributeError: 'int' object has no attribute 'autoscale_None'
>>
>> This part of the traceback is also a little puzzling; I'm not sure why
>> self.norm is an int at this point.
>>
>>> I assume this a bug of some sort.
>>
>> No, I think the problem is that you are passing a class instead of an
>> instance of a class as the norm kwarg to hexbin. (It is not
>> completely clear to me from the traceback, however--there is that
>> strange single quote mark.) What kind of normalization are you trying
>> to to? In other words, what are you trying to accomplish by
>> specifying the norm kwarg?
>>
>> Eric
>>
>>
>>> Thanks for any ideas.
>>> Mike
>>> Using:
>>> os-x 10.5.6
>>> python 2.5.4 from macports
>>> matplotlib 0.98.5.2 from macports
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