matplotlib-users Mailing List for matplotlib

please, help me on this!
On 2005年3月29日 10:11:20 -0800, Jan Rienyer Gadil <jr...@gm...> wrote:
> any help will be very much appreciated...
> or could you suggest a better implementation of this graphing part
> 
> 
> On 2005年3月29日 08:54:06 -0800, Jan Rienyer Gadil <jr...@gm...> wrote:
> > could anyone show me how to incorporate this example on my GUI?
> >
> > what i want to do is to implement this in a wxPanel that is part of my
> > wxFrame, but i am getting errors that says wxPanel instance has no
> > attribute GetToolBar...
> >
> > how am i going to get around with this???
> >
> > actually, i am doing this because i'm making a graph based on some
> > data stored on a list. what i am thinking is to just replace t,s,and c
> > part of this example with my group of list :
> >
> > def plot_data(self):
> > # Use ths line if using a toolbar
> > a = self.fig.add_subplot(111)
> >
> > # Or this one if there is no toolbar
> > #a = Subplot(self.fig, 111)
> >
> > t = numpy.arange(0.0,3.0,0.01)
> > s = numpy.sin(2*numpy.pi*t)
> > c = numpy.cos(2*numpy.pi*t)
> > a.plot(t,s)
> > a.plot(t,c)
> > self.toolbar.update()
> >
> > please, i need help asap...
> >
>

Hi,
I'm trying to embed matplotlib on WX (which seems to work well for the=20
moment). I'd like to avoid the wx mainloop() by making it run in a=20
different thread than that of my main program.
The classical way of doing (using show() ) doesn't work. The first time,=20
the figure becomes the main thread and my program stops running until I=20
close the window. The second time I call it though, my program remains=20
the main thread... Check the following code
import threading
import matplotlib
matplotlib.use('WX')
from matplotlib.pylab import *
def f():
 fig =3D Figure(figsize=3D(8,6))
 data =3D range(10)
 plot(data)
 show()
f()
print 'here'
f()
print 'here'
f()
The screen prints 'here' only after closing the figure with the mouse.=20
Then second figure appears, but the screen prints 'end' without me=20
having to close the figure like the first one. The third figure though=20
does not appear at all!
What am I doing wrong? I know I can use the show command only once, but=20
my program runs sequently and I need to plot data while it runs. I also=20
tried to run this function in a different thread but the results are=20
similar :
t =3D threading.Thread(target =3D f)
t.start()
print 'here'
tt =3D threading.Thread(target =3D f)
tt.start()
print 'end'
If the last three lines are neglected (plot only once), then it works=20
perfectly! My main program terminates its execution and the figure stays=20
alive until I close it. When f() is called two times though, both=20
windows close when my program terminates...
Does anyone have an idea of how I should do this?
Thanks in advance,
Kosta
PS: I also ttried the example embedding-in-wx-2.py which seems to be=20
exactly my case for embedding my program in a GUI. The best would be=20
running that example in a different thread or something like that in=20
order to avoid the mainloop(). Any ideas?
--=20
Kosta Gaitanis
Laboratoire de T=E9l=E9communications et T=E9l=E9d=E9tection - TELE
Universit=E9 catholique de Louvain UCL - FSA / ELEC
B=E2timent Stevin, a.156
Place du Levant, 2
B-1348 Louvain-La-Neuve, Belgium
Tel: +32 10/47.80.75
e-mail: gai...@te...=20

any help will be very much appreciated...
or could you suggest a better implementation of this graphing part
On 2005年3月29日 08:54:06 -0800, Jan Rienyer Gadil <jr...@gm...> wrote:
> could anyone show me how to incorporate this example on my GUI?
> 
> what i want to do is to implement this in a wxPanel that is part of my
> wxFrame, but i am getting errors that says wxPanel instance has no
> attribute GetToolBar...
> 
> how am i going to get around with this???
> 
> actually, i am doing this because i'm making a graph based on some
> data stored on a list. what i am thinking is to just replace t,s,and c
> part of this example with my group of list :
> 
> def plot_data(self):
> # Use ths line if using a toolbar
> a = self.fig.add_subplot(111)
> 
> # Or this one if there is no toolbar
> #a = Subplot(self.fig, 111)
> 
> t = numpy.arange(0.0,3.0,0.01)
> s = numpy.sin(2*numpy.pi*t)
> c = numpy.cos(2*numpy.pi*t)
> a.plot(t,s)
> a.plot(t,c)
> self.toolbar.update()
> 
> please, i need help asap...
>

>>>>> "Humufr" == Humufr <hu...@ya...> writes:
 Humufr> I obtain an error message when I tried to use the quiver
 Humufr> sample: Traceback (most recent call last): File
 Humufr> "quiver_demo.py", line 8, in ? quiver( X, Y, U, V, 0.2,
 Humufr> color=True ) File
 Humufr> "/usr/local/lib/python2.4/site-packages/matplotlib/pylab.py",
 Humufr> line 2105, in quiver ret = gca().quiver(*args, **kwargs)
 Humufr> File
 Humufr> "/usr/local/lib/python2.4/site-packages/matplotlib/axes.py",
 Humufr> line 894, in quiver if C: File
 Humufr> "/usr/local/lib/python2.4/site-packages/numarray/generic.py",
 Humufr> line 490, in __nonzero__ raise RuntimeError("An array
 Humufr> doesn't make sense as a truth value. Use any(a) or
 Humufr> all(a).") RuntimeError: An array doesn't make sense as a
 Humufr> truth value. Use any(a) or all(a).
Thanks for the report. Replace line 894 in axes.py
OLD:
 if C:
NEW
 if C is not None:
JDH

I obtain an error message when I tried to use the quiver sample:
Traceback (most recent call last):
 File "quiver_demo.py", line 8, in ?
 quiver( X, Y, U, V, 0.2, color=True )
 File "/usr/local/lib/python2.4/site-packages/matplotlib/pylab.py", 
line 2105, in quiver
 ret = gca().quiver(*args, **kwargs)
 File "/usr/local/lib/python2.4/site-packages/matplotlib/axes.py", line 
894, in quiver
 if C:
 File "/usr/local/lib/python2.4/site-packages/numarray/generic.py", 
line 490, in __nonzero__
 raise RuntimeError("An array doesn't make sense as a truth value. 
Use any(a) or all(a).")
RuntimeError: An array doesn't make sense as a truth value. Use any(a) 
or all(a).
with:
cvs status lib/matplotlib/axes.py
===================================================================
File: axes.py Status: Up-to-date
 Working revision: 1.86
 Repository revision: 1.86 
/cvsroot/matplotlib/matplotlib/lib/matplotlib/axes.py,v
and numarray 1.2.3
 N.

Michael Brady wrote:
> When using Basemap with a Mercator projection, is there a simple way 
> to tell the Axes to label the y-axis ticks in latitude degrees instead 
> of native map coord meters?
>
> Here's the way I did it. I created my own Formatter:
>
>
> class MercYAxisFormatter( matplotlib.ticker.Formatter ):
> """The format function for Mercator projection Y-axis.
> Translates plot y in meters to latitude.
> """
>
> def __init__( self, baseMap ):
> self.baseMap = baseMap
>
> def __call__( self, y, pos=1 ):
> """Return the label for tick value y at position pos.
> """
>
> lon, lat = self.baseMap( 0.0, y, inverse=True )
> return "%.0f" % lat
>
>
> and added it like so:
>
> baseMap = Basemap( ... )
> ax.yaxis.set_major_formatter( MercYAxisFormatter( baseMap ) )
>
>
> This works just fine, but is there a simple one-liner in Basemap that 
> I'm missing that does this?
>
> Thanks,
>
> Michael
>
Michael: No, you're not missing anything - the functionality of basemap 
is rather basic at this point. Thanks for the tip though!
-Jeff
-- 
Jeffrey S. Whitaker Phone : (303)497-6313
Meteorologist FAX : (303)497-6449
NOAA/OAR/CDC R/CDC1 Email : Jef...@no...
325 Broadway Office : Skaggs Research Cntr 1D-124
Boulder, CO, USA 80303-3328 Web : http://tinyurl.com/5telg

I've been trying in vain to get the correct format for
the y-axis. I am doing an intraday financial chart
and would like to label the ticks every 5 minutes. I
am following the example located @
http://matplotlib.sourceforge.net/screenshots/finance_work2.py
Data gets loaded from the CSV file just like in the
example.
I have something along these lines:
hours = HourLocator()
minutes = MinuteLocator()
timeFmt = DateFormatter('%H:%M')
ax.xaxis.set_major_locator(hours)
ax.xaxis.set_minor_locator(minutes)
ax.xaxis.set_minor_formatter(timeFmt)
ax.autoscale_view()
Am I too far off target here? Because I can't get it
to work.
I've also looked at the user's manual (5.4 example 2:
date ticking). Could someone please point me in the
right direction or provide an example of how it
_should_ be done? Thank you in advance.
		
__________________________________ 
Do you Yahoo!? 
Yahoo! Small Business - Try our new resources site!
http://smallbusiness.yahoo.com/resources/ 

When using Basemap with a Mercator projection, is there a simple way to 
tell the Axes to label the y-axis ticks in latitude degrees instead of 
native map coord meters?
Here's the way I did it. I created my own Formatter:
class MercYAxisFormatter( matplotlib.ticker.Formatter ):
 """The format function for Mercator projection Y-axis.
 Translates plot y in meters to latitude.
 """
 def __init__( self, baseMap ):
 self.baseMap = baseMap
 def __call__( self, y, pos=1 ):
 """Return the label for tick value y at position pos.
 """
 lon, lat = self.baseMap( 0.0, y, inverse=True )
 return "%.0f" % lat
and added it like so:
 baseMap = Basemap( ... )
 ax.yaxis.set_major_formatter( MercYAxisFormatter( baseMap ) )
This works just fine, but is there a simple one-liner in Basemap that I'm 
missing that does this?
Thanks,
Michael
-- 
========================================================================
 Michael Brady
 Jet Propulsion Laboratory (M/S 301-140L)
 4800 Oak Grove Drive
 Pasadena, CA 91109 E-mail: Michael.Brady@...
========================================================================

could anyone show me how to incorporate this example on my GUI?
what i want to do is to implement this in a wxPanel that is part of my
wxFrame, but i am getting errors that says wxPanel instance has no
attribute GetToolBar...
how am i going to get around with this???
actually, i am doing this because i'm making a graph based on some
data stored on a list. what i am thinking is to just replace t,s,and c
part of this example with my group of list :
def plot_data(self):
 # Use ths line if using a toolbar
 a = self.fig.add_subplot(111)
 
 # Or this one if there is no toolbar
 #a = Subplot(self.fig, 111)
 
 t = numpy.arange(0.0,3.0,0.01)
 s = numpy.sin(2*numpy.pi*t)
 c = numpy.cos(2*numpy.pi*t)
 a.plot(t,s)
 a.plot(t,c)
 self.toolbar.update()
please, i need help asap...

jdh...@ac... a écrit :
> We are in favor of unicode support in agg, we just haven't had the
> time, knowledge or man-power to do it. fonts are hard, as you
> probably know, and we have to figure out the right handling in
> freetype and the ft2font wrapper, in the pycxx extension generating
> code, and in the font manager. All manageable, but tough.
It sounds good and I know this is a hard job even if I have no idea of 
how things get work in matplotlib! Having unicode without Agg is already 
great to me.
> 
> Have you seen the accented character demo?
> 
> http://matplotlib.sf.net/examples/accented_text.py
Yes I have but was a little bit disappointed since this nested 
expression fails (matplotlib 0.72):
\rm{\acute{e}}
> Hopefully, someone (maybe you <wink>) will find the time to tackle
> unicode support for ft2font, font_manager, and backend_agg in the
> not-too-distant-future.
> 
> JDH
Believe me I would really be glad to participate to the matplotlib 
source code. Unfortunately I don't think I have the required skills 
(unless you know some introducing pages that could change my opinion?) 
and my company - a research centre - isn't mature enough to let us 
participate to open source :-(. It is even hard to make people accept 
open source software for everyday use... They don't feel secure if do 
not pay for!
JM. Philippe