On Wed, Aug 11, 2010 at 8:43 AM, Tony S Yu <tsy...@gmail.com> wrote:
>
> On Aug 11, 2010, at 6:56 AM, Rob Schneider wrote:
>
>>
>> I extract data out of a database (via Django and Python). I'm drawing two
>> bar charts. One is a stacked bar, and one is a simple bar.
>> The code for each graph is in their own function. I call the function to
>> draw the graph sequencially (in function "CreateAllWebSite() below).
>>
>> Problem is that when I do this, the graph called second comes out all
>> jumbled. See attached copies of png files. If I swap the function calls,
>> always first is ok and the the second one is jumbled. If I call them one at
>> a time, they both work just fine (which is how i developed the second).
>> once put together, the second is wrong. For example, the legend from the
>> first graph gets put on the second graph . The x-axis for the second is all
>> jumbled at the bottom left corner of the graph instead of along the x-axis
>> properly.
>>
>> I'm using Matplotlib 0.98.5.3 on OS X. I will upgrade to 1.0 of Matplot lib
>> soon.
>>
>> I suspect some sort of memory issue; perhaps caused by how I import
>> matplotlib in the global section of the python program; but far as I can
>> tell this is correct, or is it? I suspect memory as how else would legend
>> from the first graph get put on the second graph? Is there some sort of
>> reset function to call to clear out the old graph? I sort of thought that
>> calling a completely different function would cover that.
>>
>> Here's the code extract with portions I think no relevant snipped out. From
>> debugging I'm confident the number arrays holding the data is ok. As I
>> said, when producing the graphs one at a time, it work fine. So that code
>> snipped out below.
>>
>> #!/usr/bin/env python
>> # -*- coding: UTF-8 -*-
>>
>> import matplotlib
>> matplotlib.use('Agg') # before importing pyplot per docs
>> import matplotlib.pyplot as plt
>> import numpy as np
>>
>> [snipped the import of Python and Django libraries]
>>
>> ###########################################################
>> def CreateAllWebSite():
>> # here is the one function that calls the two graphing functions
>> sequentially.
>> # whichever of these is called first is done fine. Second flawed. calling
>> one at at time, each works ok
>> CreateMemberStatFigure()
>> CreateMemberStatCategoryFigure()
>> ###############################################
>> def CreateMemberStatFigure():
>> # this function creates a stacked bar chart
>> [snipped out portions where arrays created]
>
> Hi Rob,
>
> It would be helpful if you could provide a runnable example. I know it's a
> pain, but you should simplify your example so that it's runnable with only
> matplotlib and numpy You should create some fake data to replace these
> portions that you've cut out. Plus there are some (Django?)
> classes/functions/globals that are undefined.
>
Agreed. The only thing I can think of is that the second figure is
reusing the first. You can try calling plt.figure() at the beginning
of the functions to create a new figure, or call plt.figure() in
between the calls to CreateMemberStatCategoryFigure() and
CreateMemberStatFigure(). I can't be sure since you didn't include the
code that actually calls these functions.
Ryan
--
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
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