[Matplotlib-users] Proper way to draw bar graphs with dates?

[John Harrison]

I'm a matplotlib newbie and I'm trying to figure out the proper way  
to draw a bar graph with dates along the x-axis.  I am able to draw  
graph that properly uses dates with the plot_date() call and I can do  
a bar graph with bar().  I can even use the following code to get the  
output that I want:

plot_date(dates,units,visible = False)
bar(dates,units,width=5.0)
show()

but it seems to me that plotting and invisible plot_date graph is a  
bit clunky.

What is the proper way to do this with the library?

thanks,
John

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Re: [Matplotlib-users] wxmpl: Can't create printer "PDF" because the id "PDF" is already used

[Ryan Krauss]

FYI, I see this same warning in another wxPython program of mine that
doesn't use mpl or wxmpl, so it seems like it is a wxPython issue.

Solutions are still welcome.

Ryan

On Nov 28, 2007 8:46 AM, Ryan Krauss <[EMAIL PROTECTED]> wrote:
> I just created a small wxmpl example that I really like (attached),
> but when I run it, I get these error messages:
>
> ** (python:18091): WARNING **: Can't create printer "PDF" because the
> id "PDF" is already used
>
> (python:18091): GnomePrintCupsPlugin-WARNING **: The CUPS printer PDF
> could not be created
>
>
> (python:18091): GnomePrintCupsPlugin-WARNING **: The data for the CUPS
> printer PDF could not be loaded.
>
>
> I don't know if this is wxmpl specific, caused by wxPython, or caused
> by matplotlib, but I would like to make it go away.  Any thoughts?
>
> Thanks,
>
> Ryan
>

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Re: [Matplotlib-users] Wanted: recommendations on embedding matplotlib in a wxPython application

[Rich Shepard]

On Wed, 28 Nov 2007, Ryan Krauss wrote:

> I may be jumping into this conversation way too late, but I really like
> wxmpl.  The one bell and whistle that I love is the click-and-drag box
> zoom available by default.  Attached is my hacked together simple example
> of putting a wxmpl.PlotPanel on a wx.notebook.

Ryan,

   Thank you very much. Our application neither needs nor wants user
interaction. The plots are strictly for display.

Rich

-- 
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Applied Ecosystem Services, Inc.|Innovation
 Voice: 503-667-4517  Fax: 503-667-8863

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[Matplotlib-users] wxmpl: Can't create printer "PDF" because the id "PDF" is already used

[Ryan Krauss]

I just created a small wxmpl example that I really like (attached),
but when I run it, I get these error messages:

** (python:18091): WARNING **: Can't create printer "PDF" because the
id "PDF" is already used

(python:18091): GnomePrintCupsPlugin-WARNING **: The CUPS printer PDF
could not be created


(python:18091): GnomePrintCupsPlugin-WARNING **: The data for the CUPS
printer PDF could not be loaded.


I don't know if this is wxmpl specific, caused by wxPython, or caused
by matplotlib, but I would like to make it go away.  Any thoughts?

Thanks,

Ryan
#!/usr/bin/env python

import wx

from wxmpl import PlotPanel

from scipy import *

class MyFrame(wx.Frame):
def __init__(self, parent, title):
wx.Frame.__init__(self, parent, -1, title,
  pos=(150, 150), size=(650, 700))
# Create the menubar
menuBar = wx.MenuBar()

# and a menu 
menu = wx.Menu()

# add an item to the menu, using \tKeyName automatically
# creates an accelerator, the third param is some help text
# that will show up in the statusbar
menu.Append(wx.ID_EXIT, "E&xit\tAlt-X", "Exit the application")

# bind the menu event to an event handler
self.Bind(wx.EVT_MENU, self.OnTimeToClose, id=wx.ID_EXIT)

# and put the menu on the menubar
menuBar.Append(menu, "&File")
self.SetMenuBar(menuBar)

#create the notebook
self.notebook = wx.Notebook(self, -1, style=0)

#create the first pane for the notebook
self.notebook_pane_1 = wx.Panel(self.notebook, -1)

#create the sizer for the first pane
grid_sizer = wx.FlexGridSizer(2, 1, 0, 0)

#create widgets for pane one
self.PlotPanel = PlotPanel(self.notebook_pane_1, -1)
self.button_1 = wx.Button(self.notebook_pane_1, -1, "button_1")

#add the widgets to pane one's sizer
grid_sizer.Add(self.PlotPanel, 0, 0, 0)
grid_sizer.Add(self.button_1, 0, 0, 0)

self.notebook_pane_1.SetSizer(grid_sizer)

grid_sizer.AddGrowableCol(0)
grid_sizer.AddGrowableRow(0)
#Add pane one to the notebook
self.notebook.AddPage(self.notebook_pane_1, "tab1")

#create the sizer for the main frame
mainsizer = wx.BoxSizer(wx.VERTICAL)
#add the notebook to the sizer
mainsizer.Add(self.notebook, 1, wx.EXPAND, 0)

self.SetSizer(mainsizer)
mainsizer.Fit(self)
self.Layout()
self.InitialPlot()


def InitialPlot(self):
fig = self.PlotPanel.get_figure()
ax = fig.add_subplot(111)
ax.cla()
t = arange(0,1,0.01)
y = sin(2*pi*t)
x = cos(4*pi*t)
ax.plot(t,y,t,x)
ax.set_xlabel('Time (sec)')
ax.set_ylabel('$y(t)$')


def OnTimeToClose(self, evt):
"""Event handler for the button click."""
print "See ya later!"
self.Close()


class MyApp(wx.App):
def OnInit(self):
frame = MyFrame(None, "Simple wxmpl embedding example")
self.SetTopWindow(frame)

#print "Print statements go to this stdout window by default."

frame.Show(True)
return True


if __name__ == "__main__":
app = MyApp(redirect=False)
app.MainLoop()
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Re: [Matplotlib-users] Wanted: recommendations on embedding matplotlib in a wxPython application

[Ryan Krauss]

I may be jumping into this conversation way too late, but I really
like wxmpl.  The one bell and whistle that I love is the
click-and-drag box zoom available by default.  Attached is my hacked
together simple example of putting a wxmpl.PlotPanel on a wx.notebook.

Ryan

On Nov 27, 2007 11:06 AM, C M <[EMAIL PROTECTED]> wrote:
>
>
>
> On Nov 27, 2007 11:27 AM, Rich Shepard <[EMAIL PROTECTED]> wrote:
> >
> > On Mon, 26 Nov 2007, C M wrote:
> >
> >
> > > Basically what I did (sorry if this is too basic, but I'm pretty new to
> > > this and this may jog others to correct deficiencies in this simple
> > > approach) was to:
> >
> >   This is all straightforward and clear. The one statement I've not yet
> > understood is this:
> >
> >
> > >self.graph = matplotFrame3.PlotPanel(self.panel1 ,xpoints,
> ypoints)
> >
> >   I assume that matplotFrame3 is the name of the module in which you've
> > written PlotPanel(). Is this assumption correct?
> >
>
> Exactly. That is the module which I mention importing in step 4.
>
> >
> >   I'm modifying your approach to suit our application but it seems to be
> the
> > most parsimonious and elegant solution for simple display of plots in a
> > wxPython panel.
> >
> > Thanks,
> >
> >
> >
> >
>  Glad it will help your application.
>
>
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>
#!/usr/bin/env python

import wx

from wxmpl import PlotPanel

from scipy import *

class MyFrame(wx.Frame):
def __init__(self, parent, title):
wx.Frame.__init__(self, parent, -1, title,
  pos=(150, 150), size=(650, 700))
# Create the menubar
menuBar = wx.MenuBar()

# and a menu 
menu = wx.Menu()

# add an item to the menu, using \tKeyName automatically
# creates an accelerator, the third param is some help text
# that will show up in the statusbar
menu.Append(wx.ID_EXIT, "E&xit\tAlt-X", "Exit the application")

# bind the menu event to an event handler
self.Bind(wx.EVT_MENU, self.OnTimeToClose, id=wx.ID_EXIT)

# and put the menu on the menubar
menuBar.Append(menu, "&File")
self.SetMenuBar(menuBar)

#create the notebook
self.notebook = wx.Notebook(self, -1, style=0)

#create the first pane for the notebook
self.notebook_pane_1 = wx.Panel(self.notebook, -1)

#create the sizer for the first pane
grid_sizer = wx.FlexGridSizer(2, 1, 0, 0)

#create widgets for pane one
self.PlotPanel = PlotPanel(self.notebook_pane_1, -1)
self.button_1 = wx.Button(self.notebook_pane_1, -1, "button_1")

#add the widgets to pane one's sizer
grid_sizer.Add(self.PlotPanel, 0, 0, 0)
grid_sizer.Add(self.button_1, 0, 0, 0)

self.notebook_pane_1.SetSizer(grid_sizer)

grid_sizer.AddGrowableCol(0)
grid_sizer.AddGrowableRow(0)
#Add pane one to the notebook
self.notebook.AddPage(self.notebook_pane_1, "tab1")

#create the sizer for the main frame
mainsizer = wx.BoxSizer(wx.VERTICAL)
#add the notebook to the sizer
mainsizer.Add(self.notebook, 1, wx.EXPAND, 0)

self.SetSizer(mainsizer)
mainsizer.Fit(self)
self.Layout()
self.InitialPlot()


def InitialPlot(self):
fig = self.PlotPanel.get_figure()
ax = fig.add_subplot(111)
ax.cla()
t = arange(0,1,0.01)
y = sin(2*pi*t)
x = cos(4*pi*t)
ax.plot(t,y,t,x)
ax.set_xlabel('Time (sec)')
ax.set_ylabel('$y(t)$')


def OnTimeToClose(self, evt):
"""Event handler for the button click."""
print "See ya later!"
self.Close()


class MyApp(wx.App):
def OnInit(self):
frame = MyFrame(None, "Simple wxmpl embedding example")
self.SetTopWindow(frame)

#print "Print statements go to this stdout window by default."

frame.Show(True)
return True


if __name__ == "__main__":
app = MyApp(redirect=False)
app.MainLoop()
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[Matplotlib-users] ytick fontsize for exponentials

[Jesper Larsen]

Hi matplotlib users

I am trying to fit a substantial number of subplots into a single plot.
I would therefore like to reduce the font size of my x- and yticks. Some
of the plots contain very large numbers on the y-axis. Using the default
formatting this means that the exponential will be written above the
plot. When the font size of the y-axis is reduced the font size of the
exponential above the plot is not reduced as shown in the example code
below:

import pylab

pylab.figure()
x = [1, 2, 3]
y = [1e13, 2e13, 3e13]
pylab.plot(x,y)
pylab.xticks(fontsize=6)
pylab.yticks(fontsize=6)
pylab.savefig('test.png')

Has anyone got any suggestions on how to reduce the font size of the
exponential as well or is this a bug in matplotlib?

- Jesper

-- 
Jesper Larsen, Ph.D.
Scientist
National Environmental Research Institute 
University of Aarhus
Department of Marine Ecology 
Frederiksborgvej 399 
DK-4000 Roskilde 
Denmark 
tel: +45 46301866
http://www.neri.dk


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