matplotlib-users Mailing List for matplotlib

Chris,
Do you have any online tutorial for this topic? 
Thanks,
JJ
On Thu, 2009年06月18日 at 08:38 -0700, Chris Withers wrote:
> Hi All,
> 
> Too many people in the Python community *still* think the only way to
> work with Excel files in Python is using COM on Windows.
> 
> To try and correct this, I'm giving a tutorial at this year's
> EuroPython
> conference in Birmingham, UK on Monday, 29th June that will cover
> working with Excel files in Python using the pure-python libraries
> xlrd,
> xlwt and xlutils.
> 
> I'll be looking to cover:
> 
> - Reading Excel Files
> 
> Including extracting all the data types, formatting and working
> with
> large files.
> 
> - Writing Excel Files
> 
> Including formatting, many of the useful frilly extras and writing
> large excel files.
> 
> - Modifying and Filtering Excel Files
> 
> A run through of taking existing Excel files and modifying them in
> various ways.
> 
> - Workshop for your problems
> 
> I'm hoping anyone who attends will get a lot out of this! If you're
> planning on attending and have a particular problem you'd like to
> work
> on in this part of the tutorial, please drop me an email and I'll
> try
> and make sure I come prepared!
> 
> All you need for the tutorial is a working knowledge of Excel and
> Python, with a laptop as an added benefit, and to be at EuroPython
> this
> year:
> 
> http://www.europython.eu/
> 
> I look forward to seeing you all there!
> 
> Chris
> 
> --
> Simplistix - Content Management, Zope & Python Consulting
> - http://www.simplistix.co.uk
> 
> 
> --
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> 
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> 
> 
> 
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Hi,
You can try to manually adjust x-limits.
plt.xlim(dateList[0], dateList[-1])
However, manual adjustments will become a bit more difficult as your
plot gets more complex.
Well, I think the best way is to install a newer version of mpl on
your ubuntu 8.10 if possible.
-JJ
On Thu, Jun 18, 2009 at 2:18 PM, Dave Coutts<dac...@go...> wrote:
> Hi All
>
> Just wondering if anybody could give me some pointers on the problem I have
> described below ?
>
> For those that getting redirected to the freehostia main page for what ever
> reason, please try this link.
> http://waka.freehostia.com/python/
>
> Thanks
>
>> Hi
>>
>> I am developing on a Desktop install Ubuntu 9.04 machine with matplotlib
>> 0.98.5.2,
>> and running the scripts on a Server install Ubuntu 8.10 machine with
>> matplotlib 0.98.3.
>>
>> I have found that the X axis layout for the same script varies between the
>> two machines.
>> Both have standard matplotlib installs using apt-get. I haven't made any
>> tweaks.
>>
>> Rather than go into great detail about the problem, please see the script
>> below and links to the resulting png files.
>> I hope the png files tell the story.
>>
>> http://waka.freehostia.com/python/date_axis_scaling_test.py
>> http://waka.freehostia.com/python/date_axis_scaling_test_0_98_3.png
>> http://waka.freehostia.com/python/date_axis_scaling_test_0_98_5_2.png
>>
>> The plot produced by
>> matplotlib 0.98.3 isn't what I want.
>> Id like the plot to go edge to edge on the x axis grid, as the matplotlib
>> 0.98.5.2 version does.
>>
>> Help and advise would be appreciated.
>> PS : I'm new to python &
>> matplotlib
>>
>>
>> ######################################################################################
>> #!/usr/bin/env python
>> import matplotlib
>> matplotlib.use('Agg')
>> import matplotlib.pyplot as plt
>> from datetime import datetime, timedelta
>>
>> version  = matplotlib.__version__
>> HOURSBACK = 365 * 24
>> now    = datetime.now()
>> valueList = []
>> dateList = []
>>
>> for i in range(HOURSBACK):
>>   hoursBack = timedelta( hours = (HOURSBACK - i) )
>>   then = now - hoursBack
>>   valueList.append( i )
>>   dateList.append( then )
>>
>> fig = plt.figure( figsize=(12, 9), dpi=100 )
>> ax = fig.add_subplot(111)
>> ax.plot(dateList, valueList)
>> plt.title('Date axis scaling test for matplotlib version : %s' % (
>> version ) )
>> plt.grid(True)
>> plt.ylabel('Widgets')
>> plt.xlabel('Date')
>> fig.autofmt_xdate()
>>
>> plt.savefig( "date_axis_scaling_test_%s.png" % version.replace('.','_'),
>> format='png' )
>>
>> quit()
>>
>> ######################################################################################
>>
>>
>
>
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>

Hey there,
In the application I'm building, I'm using Python 2.5 to place a toolbar
from Matplotlib 0.98.5.2 in a Qt 4 environment. Now I'd like to modify the
toolbar to suit our needs. So, I've done the following:
> from PyQt4 import QtGui
> from matplotlib.backends.backend_qt4 import NavigationToolbar2QT
> from matplotlib.backend_bases import NavigationToolbar2
> 
> class Toolbar(NavigationToolbar2QT) :
> 	def __init__(self , parent , canvas, coordinates=True) :
> 		self.canvas = canvas
> 		self.coordinates = coordinates
> 		QtGui.QWidget.__init__( self, parent )
> 		NavigationToolbar2.__init__( self, canvas )
> 
I'd like to delete the configure subplots button, and add a new button in
it's place. However, I can't seem to find the configure subplots button, as
it is not listed in its method/object list. So, I had to use this crude
method:
> 		pushButtonCounter = -1
> 		for child in self.children():
> 			if str( type(child) ) == "<class 'PyQt4.QtGui.QToolButton'>":
> 				pushButtonCounter += 1
> 				if pushButtonCounter == 6:
> 					configuresubplots_button = child
> 
Also, Python 2.5 crashes when trying to do certain things with the button:
> 		configuresubplots_button.deleteLater() # Crashes
> 		# Ugh, I forgot what other kinds of operations make Python crash... I
> think trying to connect and disconnect functions didn't go right... not
> sure though.
> 
These things, however, do work (or at least don't make Python crash):
> 		configuresubplots_button.setEnabled(False) # Works
> 		configuresubplots_button.setHidden(True) # Does not work, but doesn't
> cause a crash, either.
> 		configuresubplots_button.setIcon(QtGui.QIcon('newicon.PNG')) # Works
> 		configuresubplots_button.setToolTip('Another tool tip') # Works
> 		configuresubplots_button.connect(child, QtCore.SIGNAL('clicked()'),
> self.new_fuction) # Works, though this should only be done after you
> instantiate this class in your GUI. So, you have to loop again to find the
> button to connect it.
> 
So, in the end, I managed to change the configure_subplots button into the
button I want. However, such a method should not be necessary.
The question is whether I was doing something wrong, and if so, how I could
have done this differently?
My sincere thanks for your time and efforts!
Cheers,
Gert-Jan
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