matplotlib-users Mailing List for matplotlib

i figured out what i did wrong and so am writing it here in case it
helps others.
the basic issue is that the .ttf font was missing in the new
matplotlib directory. to discover this, i ran python with
--verbose-debug as suggested in previous threads by others. then i
copied my version of Helvetica.ttf into:
/Library/Python/2.5/site-packages/matplotlib/mpl-data/fonts/pdfcorefonts
and
/Library/Python/2.5/site-packages/matplotlib/mpl-data/fonts/ttf
then everything worked and i was able to change fonts to helvetica.
thanks.
On Sat, Aug 22, 2009 at 7:12 PM, per freem<per...@gm...> wrote:
> Hi all,
>
> the following code used to work for me in matplotlib-0.98 to make a
> simple scatter plot and change the font from the default font to
> Helvetica (I am using mac os x).
>
> import matplotlib
> matplotlib.use('PDF')
> import matplotlib.pyplot as plt
> from matplotlib import rc
> rc('font',**{'family':'sans-serif','sans-serif':['Helvetica']})
> from scipy import *
> from numpy import *
>
> my_fig = plt.figure(figsize=(6,5), dpi=100)
> x = rand(100)*300
> y = rand(100)
> plt.scatter(x, y)
> plt.rcParams['xtick.direction'] = 'out'
> plt.rcParams['ytick.direction'] = 'out'
> c = 0.05*300.5
> plt.xlim([0-c, 300+c])
> plt.ylim([-0.05, 1.05])
> plt.savefig('x.pdf')
>
> i recently upgraded to matplotlib-0.99 and the changing of the font
> using the above method no longer works. the figure is plotted the
> same, but the font remains the default matplotlib font.
>
> one potential problem in the installation was this: i installed
> matplotlib-0.99 using the dmg prepackaged binary installer. this
> installed matplotlib in the directory:
>
> /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages
>
> however, for some reason ipython / python2.5 was looking for packages in:
>
> /Library/Python/2.5/site-packages
>
> and so matplotlib/mpl_toolkits was not found. so I copied the
> directories 'matplotlib' and 'mpl_toolkits' from
> /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages
> to /Library/Python/2.5/site-packages. Perhaps this was the cause of
> the problem?
>
> thanks for your help.
>
> (i run my code via ipython, by the way.)
>

Hi all,
the following code used to work for me in matplotlib-0.98 to make a
simple scatter plot and change the font from the default font to
Helvetica (I am using mac os x).
import matplotlib
matplotlib.use('PDF')
import matplotlib.pyplot as plt
from matplotlib import rc
rc('font',**{'family':'sans-serif','sans-serif':['Helvetica']})
from scipy import *
from numpy import *
my_fig = plt.figure(figsize=(6,5), dpi=100)
x = rand(100)*300
y = rand(100)
plt.scatter(x, y)
plt.rcParams['xtick.direction'] = 'out'
plt.rcParams['ytick.direction'] = 'out'
c = 0.05*300.5
plt.xlim([0-c, 300+c])
plt.ylim([-0.05, 1.05])
plt.savefig('x.pdf')
i recently upgraded to matplotlib-0.99 and the changing of the font
using the above method no longer works. the figure is plotted the
same, but the font remains the default matplotlib font.
one potential problem in the installation was this: i installed
matplotlib-0.99 using the dmg prepackaged binary installer. this
installed matplotlib in the directory:
/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages
however, for some reason ipython / python2.5 was looking for packages in:
/Library/Python/2.5/site-packages
and so matplotlib/mpl_toolkits was not found. so I copied the
directories 'matplotlib' and 'mpl_toolkits' from
/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages
to /Library/Python/2.5/site-packages. Perhaps this was the cause of
the problem?
thanks for your help.
(i run my code via ipython, by the way.)

I created a simple scatter plot and a service routine to print out the coordinates of the points I pick with the cursor (based on the demo). It works until I select the pan or zoom cursor. After I zoom or pan, I can no longer get back to the normal cursor which allows me to "pick" a circle. Even clicking "home" doesn't help.
The code is shown below
--------------------------------------------------------------------------------
from matplotlib import figure,pyplot
from numpy import linspace,sin,take
fig=pyplot.figure()
ax1=fig.add_subplot(1,1,1) # (numRows, numCols, plotNum)
t=linspace(0,10,100)
y1=sin(5*t)
y2=y1+sin(10*t)
line1=ax1.scatter(y1,y2,picker=True)
def onpick1(event):
  ind = event.ind
  print 'onpick1 scatter:', ind, take(y1, ind), take(y2, ind)
  
fig.canvas.mpl_connect('pick_event', onpick1)
pyplot.show()  
--------------------------------------------------------------------------------
this is based on the demo at
http://matplotlib.sourceforge.net/examples/event_handling/pick_event_demo.html?highlight=scatter
Marc Desmarais
537 Park Av.
Long Beach, CA, 90814
 
(562) 712 8682 cell
 

Jouni K. Seppänen <jks@...> writes:
> John Owens <john_owens@...> writes:
> 
> > plot([1,2,3], [1,4,9], markerlist=['A', 'B', 'C'])
> >
> > and have it draw the first point with a rendered
> > letter 'A', the second with a 'B', and the third with
> > a 'C'. 
> 
> You could do
> 
> text(1,1,'A')
> text(2,4,'B')
> text(3,9,'C')
Quite sensible, thanks!
DW also suggests "You can use the 'hold' command to plot
multiple vectors on the same plot, each with its own marker."
Neither of those is ideal - it would be much nicer to be able
to pass either a {marker list, text list} as an argument to 
the plot command directly - but at least the workaround is 
reasonable.
JDO

On Sat, Aug 22, 2009 at 11:07 AM, marc desmarais<mde...@ya...> wrote:
> what's a "patch" for?
>
> At this address:
>
> http://matplotlib.sourceforge.net/api/artist_api.html#matplotlib.patches.Patch
>
> I found the following description of a "patch"
>
> "A patch is a 2D thingy with a face color and an edge color."
>
> Could someone expand? Why use it? When to use it? What does it look like?
Have a look at the examples that include patch in the name, for
example api/patch_collection.py and api/path_patch_demo.py
Darren

what's a "patch" for?
At this address:
http://matplotlib.sourceforge.net/api/artist_api.html#matplotlib.patches.Patch
I found the following description of a "patch"
"A patch is a 2D thingy with a face color and an edge color."
Could someone expand? Why use it? When to use it? What does it look like? 
thanks
Marc Desmarais
 

On 8/22/2009 2:42 AM Michiel de Hoon apparently wrote:
> Does anybody know why the show._needmain stuff is needed in the show() function in backend_tkagg.py?...
> If I remove the show._needmain stuff ...
> then the function still seems to work fine, and multiple show()s also works.
Define "works". It seems to me that you could
then have a script that tries to enter the mainloop
multiple times. I suspect "works" means that in
an interactive session you can enter and leave
the mainloop repeatedly?
Alan Isaac
(just another user)

I'm new in Python and QT, Do you know where I could find an example of a
mplot3d plot embebed in QT4?
Thanks for your help
german

Werner F. Bruhin wrote:
> I would like to have the percentage values shown in white instead of in 
> black within a pie chart.
> 
The following code is doing what I want, but it does not feel right.
 myPie = axes.pie(values, labels=labels, autopct=u'%1.0f%%', 
shadow=False, colors=colors)
 
 for x in myPie[2]:
 x.set_color('w')
Is there really no "cleaner" way of doing this?
Werner

Does anybody know why the show._needmain stuff is needed in the show() function in backend_tkagg.py? Currently, this function is as follows:
def show():
 """
 Show all the figures and enter the gtk mainloop
 This should be the last line of your script. This function sets
 interactive mode to True, as detailed on
 http://matplotlib.sf.net/interactive.html
 """
 for manager in Gcf.get_all_fig_managers():
 manager.show()
 import matplotlib
 matplotlib.interactive(True)
 if rcParams['tk.pythoninspect']:
 os.environ['PYTHONINSPECT'] = '1'
 if show._needmain:
 Tk.mainloop()
 show._needmain = False
show._needmain = True
If I remove the show._needmain stuff, as in:
def show():
 """
 Show all the figures and enter the gtk mainloop
 This should be the last line of your script. This function sets
 interactive mode to True, as detailed on
 http://matplotlib.sf.net/interactive.html
 """
 for manager in Gcf.get_all_fig_managers():
 manager.show()
 import matplotlib
 matplotlib.interactive(True)
 if rcParams['tk.pythoninspect']:
 os.environ['PYTHONINSPECT'] = '1'
 Tk.mainloop()
then the function still seems to work fine, and multiple show()s also works.
--Michiel.
--- On Thu, 8/20/09, Kim, Dae-Won <dw...@gm...> wrote:
> From: Kim, Dae-Won <dw...@gm...>
> Subject: Re: [Matplotlib-users] show() problem in Mac OS X 10.5.8
> To: "Michiel de Hoon" <mjl...@ya...>
> Cc: "Ryan May" <rm...@gm...>, mat...@li...
> Date: Thursday, August 20, 2009, 10:26 AM
> 
> I tested with TKAgg and WXAgg. I just bought macbook and
> I'm newbie yet. Do I need to set something special for
> the multiple show()s?
> 
> Thanks,
> 
> -Dae-Won
> 
> On Thu, Aug 20, 2009 at 10:01 AM,
> Michiel de Hoon <mjl...@ya...>
> wrote:
> 
> 
> Whether or not you can do multiple
> show()s depends on which backend you use. For example, the
> Mac OS X native backend has no problems with the multiple
> show()s in your example. Which backend were you using? While
> matplotlib does not support multiple show()s in general,
> there may be a simple solution to get that working for the
> backend you are using.
> 
> 
> 
> 
> 
> --Michiel.
> 
> 
> 
> --- On Wed, 8/19/09, Kim, Dae-Won <dw...@gm...>
> wrote:
> 
> 
> 
> > From: Kim, Dae-Won <dw...@gm...>
> 
> > Subject: Re: [Matplotlib-users] show() problem in Mac
> OS X 10.5.8
> 
> > To: "Ryan May" <rm...@gm...>
> 
> > Cc: mat...@li...
> 
> > Date: Wednesday, August 19, 2009, 2:48 PM
> 
> >
> 
> > The one 'preliminary' solution I found is
> using
> 
> > an interactive mode + raw_input.
> 
> > Here is and example,
> 
> >
> 
> >     ion()
> 
> >     plot([1,2,3,4,5])
> 
> >     raw_input('Type Enter')
> 
> >     clf()
> 
> >
> 
> >
> 
> >     plot([1,2,3,4,5])
> 
> >     raw_input('Type_Enter')
> 
> >     clf()
> 
> >     plot([1,2,3,4,5])
> 
> >     show()
> 
> >
> 
> > With this approach, I can press the enter when I want
> to
> 
> > see next figure.
> 
> >
> 
> >
> 
> >
> 
> > Though It's not as convenient as 'multiple
> 
> > show()'..
> 
> >
> 
> >
> 
> > On Wed, Aug 19, 2009 at 1:57 PM,
> 
> > Kim, Dae-Won <dw...@gm...>
> 
> > wrote:
> 
> >
> 
> >
> 
> >
> 
> >
> 
> > On Wed, Aug 19, 2009 at 1:02 PM,
> 
> > Ryan May <rm...@gm...>
> 
> > wrote:
> 
> >
> 
> >
> 
> >
> 
> > On Wed, Aug 19, 2009 at 11:55
> 
> > AM, coati <dw...@gm...>
> 
> > wrote:
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> > I have a problem with show() command in my macbook
> 
> > machine (Leopard 10.5.8).
> 
> >
> 
> > For example, if I run the script shown below
> 
> >
> 
> > (let assume it is saved as 'test.py', and I
> run a
> 
> > command 'python test.py'),
> 
> >
> 
> >
> 
> >
> 
> > ---------------------------------------
> 
> >
> 
> >
> 
> >
> 
> > plot([1,2,3,4,5])
> 
> >
> 
> > show() #first window
> 
> >
> 
> > plot([1,2,3,4,5])
> 
> >
> 
> > show() #second window
> 
> >
> 
> > plot([1,2,3,4,5])
> 
> >
> 
> > show() #third window
> 
> >
> 
> >
> 
> >
> 
> > ---------------------------------------
> 
> >
> 
> >
> 
> >
> 
> > Then the first window just pops up and I can see a
> 
> > beautiful straight line
> 
> >
> 
> > :) No problem so far.
> 
> >
> 
> > But, after I close the first window by clicking the
> close
> 
> > button of the
> 
> >
> 
> > window,
> 
> >
> 
> > other two window (second and third) just pops up and
> close
> 
> > themselves
> 
> >
> 
> > instantly
> 
> >
> 
> > even though I didn't click the close button...
> 
> >
> 
> > Also, the second and third plot is shown in the same
> 
> > window.
> 
> >
> 
> >
> 
> >
> 
> > I don't have such problem in my Ubuntu machine..
> 
> >
> 
> >
> 
> >
> 
> > Does anybody know reasons?
> 
> > show() actually handles starting the GUI mainloop, so
> you
> 
> > really shouldn't be calling it more than once from
> a
> 
> > script. Quite frankly, it's more amazing that it
> works
> 
> > on your Ubuntu macine. :) If you're wanting 3
> separate
> 
> > windows, try:
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> > plot([1,2,3,4,5])
> 
> > figure()
> 
> > plot([1,2,3,4,5])
> 
> > figure()
> 
> > plot([1,2,3,4,5])
> 
> > show()
> 
> >
> 
> > Ryan
> 
> >
> 
> > --
> 
> > Ryan May
> 
> >
> 
> > Graduate Research Assistant
> 
> > School of Meteorology
> 
> > University of Oklahoma
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> > Thanks Ryan,
> 
> >
> 
> > Hm.. it's a bit strange.. I just installed
> matplotlib
> 
> > at Ubuntu using the package manager :)
> 
> > And, another linux machines (red hat enterprise) can
> do
> 
> > this too. For the RHELs, I compiled matplotlib source
> code
> 
> > by myself.
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> > figure() works very well, but what I want to do is to
> check
> 
> > the plots one by one and thus
> 
> > I can exit the script at any time I want (because I
> usually
> 
> > have lots of figures to check and I don't want
> 
> > to pop up every of them at the same time..)
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> > Anyway, thank you very much!
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> > -----Inline Attachment Follows-----
> 
> >
> 
> >
> ------------------------------------------------------------------------------
> 
> > Let Crystal Reports handle the reporting - Free
> Crystal
> 
> > Reports 2008 30-Day
> 
> > trial. Simplify your report design, integration and
> 
> > deployment - and focus on
> 
> > what you do best, core application coding. Discover
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> 
> > new with
> 
> > Crystal Reports now. http://p.sf.net/sfu/bobj-july
> 
> > -----Inline Attachment Follows-----
> 
> >
> 
> > _______________________________________________
> 
> > Matplotlib-users mailing list
> 
> > Mat...@li...
> 
> > https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> 
> >
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
 

John Owens <joh...@ya...> writes:
> plot([1,2,3], [1,4,9], markerlist=['A', 'B', 'C'])
>
> and have it draw the first point with a rendered
> letter 'A', the second with a 'B', and the third with
> a 'C'. 
You could do
text(1,1,'A')
text(2,4,'B')
text(3,9,'C')
-- 
Jouni K. Seppänen
http://www.iki.fi/jks

Erik Schweller wrote:
> My overall goal is to generate contour plots for a wide range of input
> data. The data points are not regularly spaced and do not align to
> any grid. The data points represent measurements taken from a model
> that can take on a variety of shapes. To make matters more difficult,
> I'd prefer not to interpolate around corners of the model.
It strikes me that when you are working with unstructured data like 
this, it may be better to keep it unstrucured -- do the delanauy 
triangulation and directly contour from that. It's actually prety easy 
to contour a triangular mesh.
Unfortunately, I haven't see code to do it in scipy or MPL. Am I wrong? 
Is there something there. If not, there really should be it seems a bit 
silly to shoehorn your data to a rectangular grid just to contour it.
I suppose NN interpolation is essentially doing this already, but it 
introduces issues with a boundary that doesnt' line up to a rectangular 
grid.
As I think about it, I'm going to have to write code to do this (contour 
an unstructured triangular mesh) sometime soon, so please let me know if 
it does exist already -- if not I'll try to remember to contribute it 
when I get around to it.
-Chris
-- 
Christopher Barker, Ph.D.
Oceanographer
Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
Chr...@no...

Hey guys,
I found another typo here:
http://matplotlib.sourceforge.net/api/axes_api.html?highlight=legend#matplotlib.axes.Axes.get_legend_handles_labels
-equibalent
+equivalent
Cheers,
N
On Fri, Aug 21, 2009 at 8:29 PM, marc desmarais <mde...@ya...> wrote:
> This sentence is missing "to" or "and" I think:
>
> "These helper methods will take your data (eg. numpy arrays and strings)
> create primitive ...
>
> Is in at http://matplotlib.sourceforge.net/users/artists.html
>
> Marc Desmarais
> Long Beach, CA
>
>
>
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> trial. Simplify your report design, integration and deployment - and focus
> on
> what you do best, core application coding. Discover what's new with
> Crystal Reports now. http://p.sf.net/sfu/bobj-july
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
-- 
Nicolas Pinto
Ph.D. Candidate, Brain & Computer Sciences
Massachusetts Institute of Technology, USA
http://web.mit.edu/pinto

This sentence is missing "to" or "and" I think:
"These helper methods will take your data (eg. numpy arrays and strings) create primitive ...
Is in at http://matplotlib.sourceforge.net/users/artists.html
Marc Desmarais
Long Beach, CA
 

So I can do:
plot([1,2,3], [1,4,9], marker='+')
and it'll draw 3 points each with a + marker.
What I'd really like to do is
plot([1,2,3], [1,4,9], markerlist=['A', 'B', 'C'])
and have it draw the first point with a rendered
letter 'A', the second with a 'B', and the third with
a 'C'. 
1) Not sure how to draw a letter as my marker - are 
 markers limited to those in the marker list? Is that
 possible?
2) And is it possible to have a different marker for each
 point in a dataset, specified by a vector? I guess I
 could draw a separate plot for each point, but that's
 an enormous kludge.
JDO

On Fri, Aug 21, 2009 at 6:44 PM, Michael Cohen<mc...@ca...> wrote:
> Hi all,
> At the Scipy2009 conference I was recently told I could get better
> performance from matplotlib through an ssh tunnel by using a different
> backend. However, I can't find any introductory material on this, just
> function docs for backend_bases module. What part of the matplotlib
> call includes backend specification? What backends work well for ssh
> tunnels?
GTK and WX should work best working over ssh, and I think GTKCairo,
since these should send the drawing commands over X11 rather than the
entire raster which the *Agg backends send. We should put this in the
backends FAQ, but for now there is some additional relevant info
there:
http://matplotlib.sourceforge.net/faq/installing_faq.html#backends

Hello.
I was doing a simple test using a FIFOBuffer. I set the dataLim parameter
to the dataLim of a Line2D plot. After adding a value to the FIFO, it
raises an exception. It looks like the FIFO is trying to call
Bbox.update(), but that method does not exist. Other update_*() methods do. 
Any ideas?
Here's a snippet:
import matplotlib.pyplot as plt
from matplotlib.mlab import FIFOBuffer as FIFO
f = FIFO(100) 
p = plt.plot([0,1,2],[0,1,2])
f.dataLim = p[0].get_axes().dataLim
plt.draw()
f.add(3,3)
Here's the exception:
Traceback (most recent call last):
 File "C:\fifo.py", line 9, in <module>
 f.add(3,3)
 File "C:\Python26\lib\site-packages\matplotlib\mlab.py", line 1103, in add
 self.dataLim.update(xys, -1) #-1 means use the default ignore setting
AttributeError: 'Bbox' object has no attribute 'update'
-- 
View this message in context: http://www.nabble.com/FIFOBuffer-calls-BBox.update%2C-not-a-method-tp25088821p25088821.html
Sent from the matplotlib - users mailing list archive at Nabble.com.