matplotlib-users Mailing List for matplotlib

On Sun, Apr 30, 2006 at 08:48:06AM -1000, Eric Firing wrote:
> It might not be complicated, but forget about using imshow--it is for 
> image data, which are inherently evenly spaced. Pcolor and pcolormesh 
> don't have this limitation. Note that Zij will give the color of the 
> box with diagonal corners (Xij, Yij) and (Xi+1,j+1, Yi+1,j+1), so if Z 
> has the same dimensions as X and Y, the last row and column will not be 
> shown. If your input data are intended to give the (x,y) positions of 
> the centers of regions rather than the corners, then you will need to do 
> some sort of regridding of Z, or shifting of your X and Y points, in 
> order to get everything exactly right with pcolor and pcolormesh.
> 
> The attached script and sample data file show how you can put the data 
> from your ascii file into X, Y, and Z arrays, and plot them using pcolor 
> or pcolormesh. This is for the simple case in which treating x and y as 
> corners is good enough. Note that the grid does not have to form 
> rectangular cells; they can be quadrilaterals. I illustrated this in 
> the sample file by shifting one point.
> 
> Eric
> 
> 
> 
> 1.0 1.0 1.1
> 1.0 1.5 1.2
> 1.0 2.5 1.1
> 1.0 4.0 1.0
> 1.0 4.5 1.0
> 2.0 1.0 1.2
> 2.0 1.5 1.3
> 2.5 2.9 1.4
> 2.0 4.0 1.1
> 2.0 4.5 1.1
> 3.0 1.0 1.0
> 3.0 1.5 1.3
> 3.0 2.5 1.5
> 3.0 4.0 1.2
> 3.0 4.5 1.2
> 4.0 1.0 1.0
> 4.0 1.5 1.3
> 4.0 2.5 1.5
> 4.0 4.0 1.2
> 4.0 4.5 1.2
> #!/usr/bin/env python
> 
> from pylab import subplot, show
> from pylab import nx as N
> 
> fname = 'xyz.asc'
> nx, ny = (4,5)
> 
> lines = open(fname).readlines()
> a_list = [[float(field) for field in line.split()] for line in lines]
> a = N.array(a_list)
> 
> X = N.reshape(a[:,0], (nx, ny))
> Y = N.reshape(a[:,1], (nx, ny))
> Z = N.reshape(a[:,2], (nx, ny))
> 
> ax = subplot(1,2,1)
> ax.pcolor(X,Y,Z, shading='flat')
> 
> ax = subplot(1,2,2)
> ax.pcolormesh(X,Y,Z, shading='flat')
> 
> show()
Unfortunately, I couldn't even get this example to work. It was some
sort of error related to pcolor not being a method of subplot, or
something like that (sorry, I don't have the exact error message with
me right now).
Essentially, it seems to me that the above example *would* in
principle work, though it's still going to take me a while to get
things working. I have a thesis to turn in on Friday, or else I would
keep playing with it until I got it to work. As it is, I'm going to
have to do without it (luckily, I can use the program that's exporting
the data to make my plots, I just think they're ugly).
Perhaps in the next few weeks I'll play with it some more and write up
the results if I get it working well.
Thanks for all the responses,
Mike

Michael V. De Palatis wrote:
> On Sat, Apr 29, 2006 at 08:41:48AM -1000, Eric Firing wrote:
> 
>>How easy it is to do this depends on your ascii file format, and how the 
>>data are organized in it. Are the points in order? e.g.
>>
>>x0, y0, z00
>>x0, y1, z01
>>x0, y2, z02
>>x1, y0, z10
>>x1, y1, z11
>>x1, y2, z12
> 
> 
> This is precisely the ordering.
> 
> 
>>Are the values space-delimited, or comma-delimited, or in some other
>>format?
> 
> 
> The values are space-delimited. The way I am reading them in is with
> readline, then splitting the resulting string and appending to a list
> of x, y, and z values.
> 
> 
>>Is the grid uniform in the sense that all the x-intervals are the same 
>>and all the y-intervals are the same?
> 
> 
> Unfortunately, the grid is not uniform. From the responses I have been
> getting thus far, it's looking like this is going to be far more
> complicated than I had hoped...
It might not be complicated, but forget about using imshow--it is for 
image data, which are inherently evenly spaced. Pcolor and pcolormesh 
don't have this limitation. Note that Zij will give the color of the 
box with diagonal corners (Xij, Yij) and (Xi+1,j+1, Yi+1,j+1), so if Z 
has the same dimensions as X and Y, the last row and column will not be 
shown. If your input data are intended to give the (x,y) positions of 
the centers of regions rather than the corners, then you will need to do 
some sort of regridding of Z, or shifting of your X and Y points, in 
order to get everything exactly right with pcolor and pcolormesh.
The attached script and sample data file show how you can put the data 
from your ascii file into X, Y, and Z arrays, and plot them using pcolor 
or pcolormesh. This is for the simple case in which treating x and y as 
corners is good enough. Note that the grid does not have to form 
rectangular cells; they can be quadrilaterals. I illustrated this in 
the sample file by shifting one point.
Eric

>>>>> "giandomenico" == giandomenico sica <gia...@po...> writes:
 giandomenico> Thanks for the message. I know networkx having used
 giandomenico> it in the early development of the project. It's a
 giandomenico> good package but is missing of some basic functions
 giandomenico> that I need to use, related to the analysis of
 giandomenico> graphs. Since my programming skills are quite weak,
 giandomenico> I'm not able to supply this lack through usual
 giandomenico> python programming code. Best, Nico
I've CCd Aric Hagberg, one of the networkx developers. If you describe
the missing features, he might be able to help add them to networkx.
I believe he has also applied network theory to healthcare, though in
the epidemiology domain.
JDH
Original post below
From: gia...@po...
Subject: [Matplotlib-users] CFC: An Atlas of Linguistic Graphs
To: mat...@li...
Date: 2006年4月30日 18:44:13 +0200
X-Spambayes-Classification: ham; 0.00
I'm a researcher in graph theory and networks.
I'm working about a project connected with the theory and the applications of
linguistic graphs, which are mathematical structures useful to represent
languages and consequently to manage the organization of data in different
kinds of scientific fields.
At the present I'm developing an application of these graphs to medicine,
specifically related to the ontology of clinical diseases.
And now to the purpose of this message, which is to ask if someone in this list
can be interested in collaborating with me about the construction of an open
source software useful to represent, to analyse and to compare linguistic
graphs.
I've developed the project but don't have the necessary programming skills to
proceed with the creation of the code.
The software would be distributed in public domain and the collaboration would
be free and voluntary.
I really hope that someone can be interested.
In the case, please feel free to contact me by using my private e-mail address.
I'll be pleased to send the complete documentation related to the project.
Really many thanks.
All the best,
Giandomenico Sica
Faculty of Philosophy
Leiden University
gia...@po...
Publications
http://www.polimetrica.com/polimetrica/view/people/Sica,_Giandomenico.html
1st World Congress and School on Universal Logic
http://www.uni-log.org
-------------------------------------------------------
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_______________________________________________
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Mat...@li...
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Thanks for the message.
I know networkx having used it in the early development of the project.
It's a good package but is missing of some basic functions that I need to use,
related to the analysis of graphs. Since my programming skills are quite weak,
I'm not able to supply this lack through usual python programming code.
Best,
Nico
Quoting John Hunter <jdh...@ac...>:
>>>>>> "giandomenico" == giandomenico sica 
>>>>>> <gia...@po...> writes:
> giandomenico> graphs. I've developed the project but don't have
> giandomenico> the necessary programming skills to proceed with the
> giandomenico> creation of the code. The software would be
> giandomenico> distributed in public domain and the collaboration
>
> A useful starting point would be networkx, a python graph/network
> package. It also can use matplotlib to display them :-)
>
> http://networkx.sf.net
>
> JDH
>
>
> -------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>

>>>>> "giandomenico" == giandomenico sica <gia...@po...> writes:
 giandomenico> graphs. I've developed the project but don't have
 giandomenico> the necessary programming skills to proceed with the
 giandomenico> creation of the code. The software would be
 giandomenico> distributed in public domain and the collaboration
A useful starting point would be networkx, a python graph/network
package. It also can use matplotlib to display them :-)
 http://networkx.sf.net
JDH

I'm a researcher in graph theory and networks.
I'm working about a project connected with the theory and the applications of
linguistic graphs, which are mathematical structures useful to represent
languages and consequently to manage the organization of data in different
kinds of scientific fields.
At the present I'm developing an application of these graphs to medicine,
specifically related to the ontology of clinical diseases.
And now to the purpose of this message, which is to ask if someone in this list
can be interested in collaborating with me about the construction of an open
source software useful to represent, to analyse and to compare linguistic
graphs.
I've developed the project but don't have the necessary programming skills to
proceed with the creation of the code.
The software would be distributed in public domain and the collaboration would
be free and voluntary.
I really hope that someone can be interested.
In the case, please feel free to contact me by using my private e-mail address.
I'll be pleased to send the complete documentation related to the project.
Really many thanks.
All the best,
Giandomenico Sica
Faculty of Philosophy
Leiden University
gia...@po...
Publications
http://www.polimetrica.com/polimetrica/view/people/Sica,_Giandomenico.html
1st World Congress and School on Universal Logic
http://www.uni-log.org

Michael V. De Palatis wrote:
> Unfortunately, the grid is not uniform. From the responses I have been
> getting thus far, it's looking like this is going to be far more
> complicated than I had hoped...
Look in examples/quadmesh_demo.py .
Or pretend like it's not a grid at all and just use the information Andrew gave
you the first time:
http://www.scipy.org/Wiki/Cookbook/Matplotlib/Gridding_irregularly_spaced_data
-- 
Robert Kern
rob...@gm...
"I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth."
 -- Umberto Eco

On Sat, Apr 29, 2006 at 08:41:48AM -1000, Eric Firing wrote:
> How easy it is to do this depends on your ascii file format, and how the 
> data are organized in it. Are the points in order? e.g.
> 
> x0, y0, z00
> x0, y1, z01
> x0, y2, z02
> x1, y0, z10
> x1, y1, z11
> x1, y2, z12
This is precisely the ordering.
> Are the values space-delimited, or comma-delimited, or in some other
> format?
The values are space-delimited. The way I am reading them in is with
readline, then splitting the resulting string and appending to a list
of x, y, and z values.
> Is the grid uniform in the sense that all the x-intervals are the same 
> and all the y-intervals are the same?
Unfortunately, the grid is not uniform. From the responses I have been
getting thus far, it's looking like this is going to be far more
complicated than I had hoped...
Would it in principle be difficult to write a function similar to
imshow that can take 3 arrays and plot z (in color, say) as a function
of x and y? To me, it would seem that it would essentially be the same
as the plot function, except that it takes an extra array...
Mike

Michael,
How easy it is to do this depends on your ascii file format, and how the 
data are organized in it. Are the points in order? e.g.
x0, y0, z00
x0, y1, z01
x0, y2, z02
x1, y0, z10
x1, y1, z11
x1, y2, z12
Are the values space-delimited, or comma-delimited, or in some other format?
Is the grid uniform in the sense that all the x-intervals are the same 
and all the y-intervals are the same?
Eric
Michael V. De Palatis wrote:
> Hi all,
> 
> I am trying to use imshow to plot an image from some data. Basically,
> I have a list of x, y, and z values, and I want to plot z as a
> function of x and y.
> 
> Unfortunately, most of the examples do this as far as I can
> tell. Instead, they (at most) take a list of x and y then make a
> *function* z out of that, and plot z, rather than having actual data
> from a file for all three.
> 
> The only one that does seem to do something like this seems to be
> dependent on a binary file, which unfortunately is not the format I
> have the data in. Sure, I could convert the very large files I already
> have into binary, but in the long run, I think it would be better for
> me to be able to simply use the ASCII data that I am provided with
> since that can't be changed.
> 
> Is there an easy way to do this, or will I just have to convert the
> files?
> 
> Thanks,
> 
> Mike
> 
> 
> -------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Michael V. De Palatis wrote:
> On Sat, Apr 29, 2006 at 09:59:14AM -0700, Andrew Straw wrote:
> 
>>If you data is regularly spaced, you can just use imshow or pcolor. If
>>it's not regularaly spaced, see
>>http://www.scipy.org/Wiki/Cookbook/Matplotlib/Gridding_irregularly_spaced_data
> 
> Perhaps I'm missing something or did not explain my problem
> properly. I am well aware that what I want to use is imshow (or,
> apparently, pcolor). However, my problem is that I have all THREE
> values in data form, not just x and y (that is, I do not have a
> function to get z(x, y), but rather I have data points for z).
> 
> I do not see a straightforward way to use imshow or pcolor to be able
> to plot this data as they want a matrix that I have no idea how to
> generate.
Okay, so your x,y data is regularly spaced. What you have to do is create an
array of the appropriate size to put all of your z values in. Then go through
your list of points and populate the z array in the appropriate places. You will
have to convert your x,y coordinates into i,j indices. If you know the spacing,
this should not be difficult.
Alternatively, you can sort the (x,y,z) tuples, turn it into an array, extract
the z column, reshape the z column into the appropriate matrix, and transpose it
(presuming you want y to be vertical):
In [18]: xyz = [(1, 0, 10), (0, 1, 20), (0, 0, 30), (1, 1, 40)]
In [19]: xyz.sort()
In [20]: xyz
Out[20]: [(0, 0, 30), (0, 1, 20), (1, 0, 10), (1, 1, 40)]
In [21]: xyza = array(xyz)
In [22]: z = xyza[:,-1]
In [23]: z
Out[23]: array([30, 20, 10, 40])
In [24]: z = transpose(reshape(z, (2,2)))
In [25]: z
Out[25]:
array([[30, 10],
 [20, 40]])
-- 
Robert Kern
rob...@gm...
"I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth."
 -- Umberto Eco

On Sat, Apr 29, 2006 at 09:59:14AM -0700, Andrew Straw wrote:
> If you data is regularly spaced, you can just use imshow or pcolor. If
> it's not regularaly spaced, see
> http://www.scipy.org/Wiki/Cookbook/Matplotlib/Gridding_irregularly_spaced_data
Perhaps I'm missing something or did not explain my problem
properly. I am well aware that what I want to use is imshow (or,
apparently, pcolor). However, my problem is that I have all THREE
values in data form, not just x and y (that is, I do not have a
function to get z(x, y), but rather I have data points for z).
I do not see a straightforward way to use imshow or pcolor to be able
to plot this data as they want a matrix that I have no idea how to
generate.
Thanks,
Mike
> 
> Michael V. De Palatis wrote:
> 
> >Hi all,
> >
> >I am trying to use imshow to plot an image from some data. Basically,
> >I have a list of x, y, and z values, and I want to plot z as a
> >function of x and y.
> >
> >Unfortunately, most of the examples do this as far as I can
> >tell. Instead, they (at most) take a list of x and y then make a
> >*function* z out of that, and plot z, rather than having actual data
> >from a file for all three.
> >
> >The only one that does seem to do something like this seems to be
> >dependent on a binary file, which unfortunately is not the format I
> >have the data in. Sure, I could convert the very large files I already
> >have into binary, but in the long run, I think it would be better for
> >me to be able to simply use the ASCII data that I am provided with
> >since that can't be changed.
> >
> >Is there an easy way to do this, or will I just have to convert the
> >files?
> >
> >Thanks,
> >
> >Mike
> >
> >
> >-------------------------------------------------------
> >Using Tomcat but need to do more? Need to support web services, security?
> >Get stuff done quickly with pre-integrated technology to make your job easier
> >Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> >http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> >_______________________________________________
> >Matplotlib-users mailing list
> >Mat...@li...
> >https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> > 
> >

If you data is regularly spaced, you can just use imshow or pcolor. If
it's not regularaly spaced, see
http://www.scipy.org/Wiki/Cookbook/Matplotlib/Gridding_irregularly_spaced_data
Michael V. De Palatis wrote:
>Hi all,
>
>I am trying to use imshow to plot an image from some data. Basically,
>I have a list of x, y, and z values, and I want to plot z as a
>function of x and y.
>
>Unfortunately, most of the examples do this as far as I can
>tell. Instead, they (at most) take a list of x and y then make a
>*function* z out of that, and plot z, rather than having actual data
>from a file for all three.
>
>The only one that does seem to do something like this seems to be
>dependent on a binary file, which unfortunately is not the format I
>have the data in. Sure, I could convert the very large files I already
>have into binary, but in the long run, I think it would be better for
>me to be able to simply use the ASCII data that I am provided with
>since that can't be changed.
>
>Is there an easy way to do this, or will I just have to convert the
>files?
>
>Thanks,
>
>Mike
>
>
>-------------------------------------------------------
>Using Tomcat but need to do more? Need to support web services, security?
>Get stuff done quickly with pre-integrated technology to make your job easier
>Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
>http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
>_______________________________________________
>Matplotlib-users mailing list
>Mat...@li...
>https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> 
>

Hi all,
I am trying to use imshow to plot an image from some data. Basically,
I have a list of x, y, and z values, and I want to plot z as a
function of x and y.
Unfortunately, most of the examples do this as far as I can
tell. Instead, they (at most) take a list of x and y then make a
*function* z out of that, and plot z, rather than having actual data
from a file for all three.
The only one that does seem to do something like this seems to be
dependent on a binary file, which unfortunately is not the format I
have the data in. Sure, I could convert the very large files I already
have into binary, but in the long run, I think it would be better for
me to be able to simply use the ASCII data that I am provided with
since that can't be changed.
Is there an easy way to do this, or will I just have to convert the
files?
Thanks,
Mike

>>>>> "Ryan" == Ryan Krauss <rya...@gm...> writes:
 Ryan> I'm a dork. help xticks told me the solution (imagine that)
 Ryan> - RTFdocstring.
 Ryan> make sure to include xticks([1.75,2.0],['1.75','2.0'])
At first this example confused me, because normally
 xticks([1.75,2.0])
w/o the labels will do the right thing, ie put labels on 1.75 and
2.0. The reason it doesn't in your example is that you are using a
semilogx plot, and thus the default formatter is
ticker.LogFormatterMathtext , which only places labels on the
decades. This may be considered a bug, wart, or minor annoyance. As
you note, there is an easy workaround. 
Alternatively, it might be better to change the formatter when there
is a call to set_ticks just as we currently change the locator
 def set_ticks(self, ticks):
 """
 Set the locations of the tick marks from sequence ticks
 ACCEPTS: sequence of floats
 """
 self.set_major_locator( FixedLocator(ticks) )
 self.get_view_interval().update(ticks,0)
 return self.get_major_ticks()
JDH

I'm a dork.
help xticks told me the solution (imagine that) - RTFdocstring.
make sure to include xticks([1.75,2.0],['1.75','2.0'])
On 4/28/06, Ryan Krauss <rya...@gm...> wrote:
> I have a semilogx plot that I have zoomed into, so that there are no
> xticks visible. I can't seem to set the xticks to something that
> isn't an integer power of 10. I would actually prefer to set it to a
> number that isn't displayed as 10^xxx, but I don't know how.
>
> For example:
>
> y=3Dsin(2*pi*f)
> semilogx(f,y)
> xlim([1.5,2.5])
> xticks([1.75,2.0])
> show()
>
> has no xticks.
>
> How do I fix this?
>
> Thanks,
>
> Ryan
>

I have a semilogx plot that I have zoomed into, so that there are no
xticks visible. I can't seem to set the xticks to something that
isn't an integer power of 10. I would actually prefer to set it to a
number that isn't displayed as 10^xxx, but I don't know how.
For example:
y=3Dsin(2*pi*f)
semilogx(f,y)
xlim([1.5,2.5])
xticks([1.75,2.0])
show()
has no xticks.
How do I fix this?
Thanks,
Ryan

John Hunter wrote:
> There may be an intelligent way to set the default dir globally for file
> dialogs in wx, but I don't know what it is. So I'll suggest a workaround.
I don't think there isn't. However, it probably starts out in the 
current working directory, which you can change with:
import os
os.chdir("ThePathYouWant")
John's solution is better if this is more than a quickie app, however.
-Chris
-- 
Christopher Barker, Ph.D.
Oceanographer
 		
NOAA/OR&R/HAZMAT (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
Chr...@no...

>>>>> "Zunbeltz" == Zunbeltz Izaola <zun...@wm...> writes:
 Zunbeltz> Hi, I am embeding a matplotlib FigureCanvasWxAgg in a
 Zunbeltz> wxPython program.
 Zunbeltz> When i press the save botton the directory is that of
 Zunbeltz> the executable of the program. I want to change this to
 Zunbeltz> a certain directory. How can i do that?
There may be an intelligent way to set the default dir globally for file
dialogs in wx, but I don't know what it is. So I'll suggest a workaround.
You can create a custom toolbar and override save
from matplotlib.backends.backend_wx import NavigationToolbar2Wx
class MyToolbar(class NavigationToolbar2Wx):
 def save(self, evt):
 # Fetch the required filename and file type.
 filetypes = self.canvas._get_imagesave_wildcards()
 # insert your default dir here
 dlg =wx.FileDialog(self._parent, "Save to file", "", "", filetypes,
 wx.SAVE|wx.OVERWRITE_PROMPT|wx.CHANGE_DIR)
 if dlg.ShowModal() == wx.ID_OK:
 dirname = dlg.GetDirectory()
 filename = dlg.GetFilename()
 DEBUG_MSG('Save file dir:%s name:%s' % (dirname, filename), 3, self)
 self.canvas.print_figure(os.path.join(dirname, filename))
and then use this toolbar rather than the default one. See
examples/embedding_in_wx4.py for an example of how to use a custom
toolbar in a wx app.
JDH

Hi,
I am embeding a matplotlib FigureCanvasWxAgg in a wxPython program.
When i press the save botton the directory is that of the executable of
the program. I want to change this to a certain directory. How can i do
that?
Thanks in advance,
Zunbeltz

>>>>> "David" == David Huard <dav...@gm...> writes:
 David> Back with .86 I used to do lots of ax = axes() ax.imshow(M)
 David> but in .87 this doesn't seem to work. It doesn't complain
 David> but nothing happens. Simply calling imshow(M) does the job
 David> however, but I thought the method call was nicer. Am I
 David> missing something ?
works in svn...
JDH

Back with .86 I used to do lots of
ax =3D axes()
ax.imshow(M)
but in .87 this doesn't seem to work. It doesn't complain but nothing
happens. Simply calling imshow(M) does the job however, but I thought the
method call was nicer. Am I missing something ?
Thanks,
David

Hi,
I need to draw in my diagrams the text which will
scale along with the rest of the chart when zooming
in/out.
How can I do that?
Thx, A.

John Hunter <jdh...@ac...> writes:
> Is anyone aware of a solution which would allow the
> mail-to-news-gateway folks to still post while blocking the
> unsubscribed spammers? Presumably not....
It is possible to subscribe to the list and then set a Mailman option
to disable mail sending, so you have subscriber status without
actually getting any email. I just did that, so if this message
reaches the list, using Gmane is still possible for subscribers.
-- 
Jouni

On Wed, Apr 26, 2006 at 01:22:17PM -1000, Eric Firing wrote:
> class myLocator(MaxNLocator):
> def nonsingular(self, vmin, vmax, expander=0.001, tiny=1e-12):
> return Locator.nonsingular(self, vmin, vmax,
> expander=expander, tiny=tiny)
> and then
> 
> ax.xaxis.set_major_locator(myLocator())
This worked out of the box. Thanks!
> As an alternative approach, can you simply use as your x-coordinate time 
> deltas from a suitable base time, so that vmin and vmax would not be so 
> huge compared to their difference? My assumption while working with the 
> ticker.py code was that this would be the logical solution to this sort 
> of problem.
Well, the complication is that I not only need to be able to zoom in for
~10sec segments, but also to zoom out on long segments. So, yes, I could 
do a modulus-year operation, but that would complicate labeling of the ticks
and also in getting data points back from click events. Doable, just a
little more complicated.
> Longer term, it would be easy to modify the Locator classes so that the 
> default values of tiny and expander would appear as a kwargs in 
> __init__. Whether this would be a valuable change or mere clutter, I 
> don't know; I will listen for more advice.
If it's that simple, then I would vote for it. Surely someone will find
it useful someday. However, the work-around I've implemented isn't bad.
Thank you for your help.
Glen Mabey

Hello!
I wrote an application with matplotlib, which often (3 times a second or
more) updates the graphics window. When I switch off the update, the
aplication is quite stable, but with updates Xlib prints the following
lines and the application freezes.
Xlib: unexpected async reply (sequence 0x1318f)!
Xlib: sequence lost (0x20000 > 0x1318f) in reply type 0x0!
I do not know how to debug/backtrace this message. Does anyone have a clue?
The application is using matplotlib with pygtk and numarray, running
under Debian testing.
python-matplotlib-data 0.86.2-4
python-matplotlib-doc 0.86.2-4
python2.4-matplotlib 0.86.2-4
python2.4-gtk2 2.8.2-3
libcairo2 1.0.4-1+b1
libcairo2-dev 1.0.4-1+b1
python2.4-cairo 1.0.2-1
It is not clear to me, if this error is caused by matplotlib, but it
seems to be "correlated" to its use.
Any help is welcome.
Thanks, achim