Re: [Matplotlib-users] Hardware rendering with tricontourf
On 26 January 2012 19:36, Howard how...@renci.org wrote: I'm rendering some images with about 3.5 million triangles into a 512x512 png file using tricontourf. I'm running this in a virtual machine, and I'm pretty sure that there is no graphics rendering hardware being used. Is it possible, assuming the hardware was available, to make tricontourf use the rendering hardware? Will that happen by default? You are correct, there is no graphics hardware rendering. Rendering is controlled by the various matplotlib backends, and to my knowledge there are no backends currently available that use hardware rendering. There has been some work done on an OpenGL backend, but I am not sure of the status of this. The last time I checked it was pretty experimental. Perhaps someone involved with it can comment on its current status. Ian Thomas -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] four colour theorem
Dear all, I have a set of Voronoi bins, defined by nodes (x,y) and an underlying mesh of squared bins. See an example here of such Voronoi bins. http://www.google.fr/imgres?q=voronoi+binninghl=frsa=Xbiw=1280bih=665tbm=ischprmd=imvnsbtbnid=zp0RRIktKlF9pM:imgrefurl=http://www.aanda.org/articles/aa/full/2007/09/aa4621-05/aa4621-05.right.htmldocid=CeAk6FN_pZDa5Mimgurl=http://www.aanda.org/articles/aa/full/2007/09/aa4621-05/img26.gifw=532h=1087ei=ZmYiT-Z7xYDyA9ew0acMzoom=1iact=rcdur=164sig=112304340793152029504page=4tbnh=151tbnw=74start=63ndsp=25ved=1t:429,r:1,s:63tx=58ty=65 So basically each node, (x,y) would define a Voronoi bin made of a set of squared pixels. So one node would correspond to for example N squared pixels: node[i] = [(x1,y1),(x2,y2),...(xN,yN)] I want now to create an imshow like plot of these bins by using the four colour theorem, meaning that I would use 4 colours and want adjacent Voronoi bins not to have the same colour. Is there a simple way to do this in matplotlib? I couldn't find much on the web so far. thanks! Eric -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Events
Benjamin Root answers my query concerning user-generated events : To answer your question, take a look at how pick_event() is declared in backend_bases.py: def pick_event(self, mouseevent, artist, **kwargs): ... self.callbacks.process(s, event) The function that fires the event is self.callbacks.process(s, event), where self is the figure canvas. Dear Ben, thank you, but this is not exactly my problem. I don't want to call the callback myself, since the event should be fired from within a callback. I should have been more precise. Let's distil the problem. [This is a part of my current teaching...] I did already what you suggest here... Imagine an animation, which consists in generating a trajectory, segment after segment (say, of a planet). Classically this is a loop, but when it runs, the rest of the program is blocked. So, instead, the code behaves as a Python generator, generates just one segment, and that's all. But it yields something, it posts an event, put it in a queue, and somebody else, the mainloop() or similar, pops it off the queue and re-launches the callback. (With generators, it calls the .next()). No timers, as in Timer or Funct animations... It must be decentralized, no recursive calls. My callback from time to time creates another planet, or destroys an existent, and there are simultaneous trajectories on the screen, several concurrent events in the queue. And the system should remain reactive, interpret buttons, sliders, etc. I know how to do this by hand, how to write my own event loop, declare a queue, and how to add to my private virtual event handling also the callbacks of mouse events. But this is an overkill, I repeat the functionalities which are already there, the event queue in particular. I did it with wx. But Matplotlib protects the user from the concrete back-end, and I want to protect my students as well, so I look for a GUI-neutral solution. Thanks. Jerzy -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Overlaying part of an matrix image on another.
Hi
I have a array, M, which is (4Nx4M), and an array (image), im, which is NxM.
I can currently plot the matrix as a 2d image using imshow using:
import matplotlib.pyplot as plt
from matplotlib import cm
# some code for reading in the matrix
cmap = cm.get_cmap('jet', 256)
imM = plt.imshow(M, cmap=cmap, vmin= -1, vmax=1)
But now i would like to plot im on top of M, such that it covers the firs
element of M.
If I do
plt.hold()
plt.imshow(im)
I only see im, and not M. I'm used to doing this in Matlab, where this
would work.
Can anyone explain me what I'm doing wrong?
Kind Regards
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Re: [Matplotlib-users] Overlaying part of an matrix image on another.
On Fri, Jan 27, 2012 at 9:13 AM, Pål Gunnar Ellingsen paa...@gmail.comwrote:
Hi
I have a array, M, which is (4Nx4M), and an array (image), im, which is
NxM.
I can currently plot the matrix as a 2d image using imshow using:
import matplotlib.pyplot as plt
from matplotlib import cm
# some code for reading in the matrix
cmap = cm.get_cmap('jet', 256)
imM = plt.imshow(M, cmap=cmap, vmin= -1, vmax=1)
But now i would like to plot im on top of M, such that it covers the firs
element of M.
If I do
plt.hold()
plt.imshow(im)
I only see im, and not M. I'm used to doing this in Matlab, where this
would work.
Can anyone explain me what I'm doing wrong?
Kind Regards
A call to `plt.autoscale` should fix your problem. It looks like `imshow`
rescales the axes limits to the current image limits, instead of the limits
for all the data in the axes. (Executable example below; note, axes hold
by default, so it's not necessary to call hold).
-Tony
import numpy as np
import matplotlib.pyplot as plt
background = np.random.uniform(0, 255, size=(20, 20))
overlay = np.arange(25).reshape((5, 5))
plt.imshow(background, interpolation='nearest', cmap=plt.cm.gray)
plt.imshow(overlay, cmap=plt.cm.jet, alpha=0.5)
# You could also replace this with `plt.axis([0, 20, 0, 20])
plt.autoscale()
plt.show()
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Re: [Matplotlib-users] four colour theorem
On Friday, January 27, 2012, Eric Emsellem eemse...@eso.org wrote: Dear all, I have a set of Voronoi bins, defined by nodes (x,y) and an underlying mesh of squared bins. See an example here of such Voronoi bins. http://www.google.fr/imgres?q=voronoi+binninghl=frsa=Xbiw=1280bih=665tbm=ischprmd=imvnsbtbnid=zp0RRIktKlF9pM:imgrefurl=http://www.aanda.org/articles/aa/full/2007/09/aa4621-05/aa4621-05.right.htmldocid=CeAk6FN_pZDa5Mimgurl=http://www.aanda.org/articles/aa/full/2007/09/aa4621-05/img26.gifw=532h=1087ei=ZmYiT-Z7xYDyA9ew0acMzoom=1iact=rcdur=164sig=112304340793152029504page=4tbnh=151tbnw=74start=63ndsp=25ved=1t:429,r:1,s:63tx=58ty=65 So basically each node, (x,y) would define a Voronoi bin made of a set of squared pixels. So one node would correspond to for example N squared pixels: node[i] = [(x1,y1),(x2,y2),...(xN,yN)] I want now to create an imshow like plot of these bins by using the four colour theorem, meaning that I would use 4 colours and want adjacent Voronoi bins not to have the same colour. Is there a simple way to do this in matplotlib? I couldn't find much on the web so far. thanks! Eric None that I am aware of, but if one existed, it would likely be found within the basemap module. If it isn't in the Basemap module, it would be an awesome feature to add. Maybe something that would work with my style-cycling mechanism that I have been tinkering with to allow for users to specify 4 different hatchings for bw publications? Cheers! Ben Root -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] [matplotlib-users] How to plot y vs x with some missing points in y vector?
I want to plot something like: X(time)Ypoints 08 1 2 7 3 4 5 6 7 8 9 -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] [matplotlib-users] How to plot y vs x with some missing points in y vector?
Sorry, It's an awkward manipulation. I finish the mail 2012/1/27 Fabien Lafont lafont.fab...@gmail.com: I want to plot something like: X(time) Ypoints 0 8 1 2 7 36 44 5 6 77 82 9 10 In fact I've recorded some live datas and when I use genfromtxt() the blank parts are translated as 'nan' and I can't for example fit it with polynomials. -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] [matplotlib-users] How to plot y vs x with some missing points in y vector?
On Fri, Jan 27, 2012 at 9:52 AM, Fabien Lafont lafont.fab...@gmail.comwrote: Sorry, It's an awkward manipulation. I finish the mail 2012/1/27 Fabien Lafont lafont.fab...@gmail.com: I want to plot something like: X(time)Ypoints 08 1 27 36 44 5 6 77 82 9 10 In fact I've recorded some live datas and when I use genfromtxt() the blank parts are translated as 'nan' and I can't for example fit it with polynomials. If you plot the data, it should skip data points that are NaNs and you should see a break in the line IIRC. Is that not what you want? Ben Root -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Hardware rendering with tricontourf
On 1/27/12 3:39 AM, Ian Thomas wrote: On 26 January 2012 19:36, Howard how...@renci.org mailto:how...@renci.org wrote: I'm rendering some images with about 3.5 million triangles into a 512x512 png file using tricontourf. I'm running this in a virtual machine, and I'm pretty sure that there is no graphics rendering hardware being used. Is it possible, assuming the hardware was available, to make tricontourf use the rendering hardware? Will that happen by default? You are correct, there is no graphics hardware rendering. Rendering is controlled by the various matplotlib backends, and to my knowledge there are no backends currently available that use hardware rendering. There has been some work done on an OpenGL backend, but I am not sure of the status of this. The last time I checked it was pretty experimental. Perhaps someone involved with it can comment on its current status. Ian Thomas Ian Thanks very much for the reply. If it helps whoever is doing the OpenGL backend, I may be able to play with it a bit. Howard -- Howard Lander mailto:how...@renci.org Senior Research Software Developer Renaissance Computing Institute (RENCI) http://www.renci.org The University of North Carolina at Chapel Hill Duke University North Carolina State University 100 Europa Drive Suite 540 Chapel Hill, NC 27517 919-445-9651 -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] [matplotlib-users] How to plot y vs x with some missing points in y vector?
Yes in fact it plot it well, but then I have a vector like: [3702.13999, nan, nan, nan, 3703.79, nan, nan, nan, 3704.69001, 3704.84001] and it's impossible to fit it. It return 'nan'. Ive tried: for i in range(0,NbPts): if column1[i] == nan: column1[i].remove(nan) column2[i].remove(nan) to remove these points but it doesn't work 2012/1/27 Benjamin Root ben.r...@ou.edu: On Fri, Jan 27, 2012 at 9:52 AM, Fabien Lafont lafont.fab...@gmail.com wrote: Sorry, It's an awkward manipulation. I finish the mail 2012/1/27 Fabien Lafont lafont.fab...@gmail.com: I want to plot something like: X(time) Ypoints 0 8 1 2 7 3 6 4 4 5 6 7 7 8 2 9 10 In fact I've recorded some live datas and when I use genfromtxt() the blank parts are translated as 'nan' and I can't for example fit it with polynomials. If you plot the data, it should skip data points that are NaNs and you should see a break in the line IIRC. Is that not what you want? Ben Root -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] (no subject)
Dear Users, I want to plot a XY, the X-value is constant, but let assume Y varees from 1-10, so I want o have different colors accordingly for the range 0-2,2-4,4-6,6-8,8-10. thanks a lot najren -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] [matplotlib-users] How to plot y vs x with some missing points in y vector?
Fri, 27 Jan 2012 16:48:25 +0100 Fabien Lafont a écrit: I want to plot something like: X(time)Ypoints 08 1 2 7 3 4 5 6 7 8 9 Sorry if I'm missing something, but can't you plot Y [8,7] against X [0,2] ? -- Jérôme -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] [matplotlib-users] How to plot y vs x with some missing points in y vector?
On Fri, Jan 27, 2012 at 10:11 AM, Fabien Lafont lafont.fab...@gmail.comwrote: Yes in fact it plot it well, but then I have a vector like: [3702.13999, nan, nan, nan, 3703.79, nan, nan, nan, 3704.69001, 3704.84001] and it's impossible to fit it. It return 'nan'. Ive tried: for i in range(0,NbPts): if column1[i] == nan: column1[i].remove(nan) column2[i].remove(nan) to remove these points but it doesn't work You can't do equality tests with NaNs (us np.isnan(), instead). This question is more suited for the Numpy list. Ben Root -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] [matplotlib-users] How to plot y vs x with some missing points in y vector?
What about masked arrays ? http://docs.scipy.org/doc/numpy/reference/maskedarray.html -- Fabrice Silva -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] histogram plots color range
Hello , I have a two dimensional array, 40X20(rowsXcolumns). Each of the 40 rows themselves hold values of the bins of a distribution (which is not always normal, can expect a bimodal curve as well) It is little difficult to explain to I actually created a sample figure: http://www.flickr.com/photos/nahrenmascarenhas/6771369071/in/photostream Any help or trick will be very useful loads of thanks nahren-- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] [matplotlib-users] How to plot y vs x with some missing points in y vector?
Thanks a lot, I'll try to remove the points using isnan() 2012/1/27 Fabrice Silva si...@lma.cnrs-mrs.fr: What about masked arrays ? http://docs.scipy.org/doc/numpy/reference/maskedarray.html -- Fabrice Silva -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] [matplotlib-users] How to plot y vs x with some missing points in y vector?
On Jan 27, 2012, at 9:11 AM, Fabien Lafont wrote: Ive tried: for i in range(0,NbPts): if column1[i] == nan: column1[i].remove(nan) column2[i].remove(nan) to remove these points but it doesn't work you are close, I think what you want is: # assuming column1 and 2 are numpy arrays import numpy as np for i in range(0,NbPts): if np.isnan(column1[i]): column1=np.remove(column1,i,0) column1=np.remove(column2,i,0) 2012/1/27 Benjamin Root ben.r...@ou.edu: On Fri, Jan 27, 2012 at 9:52 AM, Fabien Lafont lafont.fab...@gmail.com wrote: Sorry, It's an awkward manipulation. I finish the mail 2012/1/27 Fabien Lafont lafont.fab...@gmail.com: I want to plot something like: X(time)Ypoints 08 1 27 36 44 5 6 77 82 9 10 In fact I've recorded some live datas and when I use genfromtxt() the blank parts are translated as 'nan' and I can't for example fit it with polynomials. If you plot the data, it should skip data points that are NaNs and you should see a break in the line IIRC. Is that not what you want? Ben Root -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Events
On Fri, Jan 27, 2012 at 5:54 AM, Jerzy Karczmarczuk
jerzy.karczmarc...@unicaen.fr wrote:
Benjamin Root answers my query concerning user-generated events :
To answer your question, take a look at how pick_event() is declared
in backend_bases.py:
def pick_event(self, mouseevent, artist, **kwargs):
...
self.callbacks.process(s, event)
The function that fires the event is self.callbacks.process(s,
event), where self is the figure canvas.
Dear Ben, thank you, but this is not exactly my problem. I don't want to
call the callback myself, since the event should be fired from within
a callback. I should have been more precise. Let's distil the problem.
[This is a part of my current teaching...] I did already what you
suggest here...
Imagine an animation, which consists in generating a trajectory, segment
after segment (say, of a planet). Classically this is a loop, but when
it runs, the rest of the program is blocked. So, instead, the code
behaves as a Python generator, generates just one segment, and that's
all. But it yields something, it posts an event, put it in a queue,
and somebody else, the mainloop() or similar, pops it off the queue and
re-launches the callback. (With generators, it calls the .next()). No
timers, as in Timer or Funct animations...
It must be decentralized, no recursive calls. My callback from time to
time creates another planet, or destroys an existent, and there are
simultaneous trajectories on the screen, several concurrent events in
the queue. And the system should remain reactive, interpret buttons,
sliders, etc.
I know how to do this by hand, how to write my own event loop, declare a
queue, and how to add to my private virtual event handling also the
callbacks of mouse events. But this is an overkill, I repeat the
functionalities which are already there, the event queue in particular.
I did it with wx. But Matplotlib protects the user from the concrete
back-end, and I want to protect my students as well, so I look for a
GUI-neutral solution.
Thanks.
Jerzy
I'm not sure if this matches your use case, but have you looked into using
a coroutine. (I only recently learned about them---see presentation slides
linked on this page http://www.dabeaz.com/coroutines/. So obviously I'm
going out of my way to find a use case :)
I've attached a simple example below.
-Tony
#~~~
import matplotlib.pyplot as plt
import numpy as np
def datalistener():
fig, ax = plt.subplots()
line, = ax.plot(0, 0, 'o-')
i = 1
while True:
y0 = yield
x = np.hstack((line.get_xdata(), i))
y = np.hstack((line.get_ydata(), y0))
line.set_data((x, y))
ax.update_datalim(np.transpose((x, y)))
ax.autoscale_view()
plt.draw()
i += 1
plt.ion()
plotdata = datalistener()
# initialize the coroutine
plotdata.next()
while True:
y = raw_input('enter data point: ')
try:
plotdata.send(float(y))
except:
break
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Re: [Matplotlib-users] histogram plots color range
On Fri, Jan 27, 2012 at 11:27 AM, nahren manuel meetnah...@yahoo.comwrote: Hello , I have a two dimensional array, 40X20(rowsXcolumns). Each of the 40 rows themselves hold values of the bins of a distribution (which is not always normal, can expect a bimodal curve as well) It is little difficult to explain to I actually created a sample figure: http://www.flickr.com/photos/nahrenmascarenhas/6771369071/in/photostream Any help or trick will be very useful loads of thanks nahren This plot seems similar to something I wanted to do (and asked the list abouthttp://www.mail-archive.com/matplotlib-users@lists.sourceforge.net/msg18761.html). I ended up getting something to work, but the code is a bit ugly. I've attached my most recent version (which probably needs some cleaning up, but it works). If you want a continuous field instead of distinct bars (like you have in your sample image), you may be able to write up something that's a little simpler by sectioning out the columns an array into strips of equal width and repeating histogram values across those columns (sorry, this is a bit vague). Then use `imshow` to plot the array. -Tony histstrip.py Description: Binary data -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] histogram plots color range
On Fri, Jan 27, 2012 at 12:18 PM, Tony Yu tsy...@gmail.com wrote: On Fri, Jan 27, 2012 at 11:27 AM, nahren manuel meetnah...@yahoo.com wrote: Hello , I have a two dimensional array, 40X20(rowsXcolumns). Each of the 40 rows themselves hold values of the bins of a distribution (which is not always normal, can expect a bimodal curve as well) It is little difficult to explain to I actually created a sample figure: http://www.flickr.com/photos/nahrenmascarenhas/6771369071/in/photostream Any help or trick will be very useful loads of thanks nahren This plot seems similar to something I wanted to do (and asked the list about). I ended up getting something to work, but the code is a bit ugly. I've attached my most recent version (which probably needs some cleaning up, but it works). If you want a continuous field instead of distinct bars (like you have in your sample image), you may be able to write up something that's a little simpler by sectioning out the columns an array into strips of equal width and repeating histogram values across those columns (sorry, this is a bit vague). Then use `imshow` to plot the array. Looks nice. Given that it is too specialized for matplotlib, it would be an interesting addition to violin and bean plots in scikits.statsmodels if you don't mind that we borrow it (scikits.statsmodels is BSD licensed). Thanks, Josef -Tony -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] histogram plots color range
On Fri, Jan 27, 2012 at 4:01 PM, josef.p...@gmail.com wrote: On Fri, Jan 27, 2012 at 12:18 PM, Tony Yu tsy...@gmail.com wrote: On Fri, Jan 27, 2012 at 11:27 AM, nahren manuel meetnah...@yahoo.com wrote: Hello , I have a two dimensional array, 40X20(rowsXcolumns). Each of the 40 rows themselves hold values of the bins of a distribution (which is not always normal, can expect a bimodal curve as well) It is little difficult to explain to I actually created a sample figure: http://www.flickr.com/photos/nahrenmascarenhas/6771369071/in/photostream Any help or trick will be very useful loads of thanks nahren This plot seems similar to something I wanted to do (and asked the list about). I ended up getting something to work, but the code is a bit ugly. I've attached my most recent version (which probably needs some cleaning up, but it works). If you want a continuous field instead of distinct bars (like you have in your sample image), you may be able to write up something that's a little simpler by sectioning out the columns an array into strips of equal width and repeating histogram values across those columns (sorry, this is a bit vague). Then use `imshow` to plot the array. Looks nice. Given that it is too specialized for matplotlib, it would be an interesting addition to violin and bean plots in scikits.statsmodels if you don't mind that we borrow it (scikits.statsmodels is BSD licensed). Thanks, Josef Sure thing---I'm happy to contribute. The code probably needs to be cleaned up, but unfortunately, I have little motivation since I don't use it anymore. Feel free to do whatever you like with it. Cheers, -Tony -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Events
Tony Yu suggests that my multiple and changing animation problems could be solved using coroutining. have you looked into using a coroutine. /... /I've attached a simple example below. import matplotlib.pyplot as plt import numpy as np def datalistener(): ... while True: y0 = yield x = np.hstack((line.get_xdata(), i)) ... plt.ion() ... Thank you Tony. No, unfortunately this is again a side solution. Of course, coroutines, or just a simple event loop using Python generators without .send(), are perfectly decent tools to simulate parallel movements. But, coroutines as such, are better adapted to situations where the actors transfer the control among themselves, where there is a network of direct communications, a multi-ping-pong. In my case this is redundant, my planets which move concurrently are independent, and they, after having updated their properties, need only to yield the control to the interface, to draw them. The interface resumes (by calling, no .send() is needed) all the actors in sequence. I repeat again : I COULD have written my own event loop (under ion()). But I don't want to do this, since show() which calls some lower level mainloop() does all this already! In particular, it handles the physical events, all mousing, which need anyway some lower-level mechanisms, and my own coroutines won't help. I MUST use the built-in tools in order to handle the mouse. So, I repeat, my only [as I see it] rational choice is to plug-in my events into the standard loop. Under, say, plain wxPython, I can write my own, and call ProcessPendingEvents(), but with Matplotlib, no idea. Ben Root suggested to look some existing codes, say the Picker. But this is called upon a physical event, which is fired under the hood. My events are virtual, I have to post them myself from a callback, so it canot call recursively another callback, or I am dead. Best regards. Jerzy -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Events
On Fri, Jan 27, 2012 at 4:54 AM, Jerzy Karczmarczuk jerzy.karczmarc...@unicaen.fr wrote: Benjamin Root answers my query concerning user-generated events : To answer your question, take a look at how pick_event() is declared in backend_bases.py: def pick_event(self, mouseevent, artist, **kwargs): ... self.callbacks.process(s, event) The function that fires the event is self.callbacks.process(s, event), where self is the figure canvas. Dear Ben, thank you, but this is not exactly my problem. I don't want to call the callback myself, since the event should be fired from within a callback. I should have been more precise. Let's distil the problem. [This is a part of my current teaching...] I did already what you suggest here... Imagine an animation, which consists in generating a trajectory, segment after segment (say, of a planet). Classically this is a loop, but when it runs, the rest of the program is blocked. So, instead, the code behaves as a Python generator, generates just one segment, and that's all. But it yields something, it posts an event, put it in a queue, and somebody else, the mainloop() or similar, pops it off the queue and re-launches the callback. (With generators, it calls the .next()). No timers, as in Timer or Funct animations... It must be decentralized, no recursive calls. My callback from time to time creates another planet, or destroys an existent, and there are simultaneous trajectories on the screen, several concurrent events in the queue. And the system should remain reactive, interpret buttons, sliders, etc. I know how to do this by hand, how to write my own event loop, declare a queue, and how to add to my private virtual event handling also the callbacks of mouse events. But this is an overkill, I repeat the functionalities which are already there, the event queue in particular. I did it with wx. But Matplotlib protects the user from the concrete back-end, and I want to protect my students as well, so I look for a GUI-neutral solution. Thanks. Jerzy Still not sure why my suggestion would not work: http://matplotlib.sourceforge.net/api/cbook_api.html#matplotlib.cbook.CallbackRegistry You can have things set up such that event being triggered can subsequently trigger other events as well. An event can even connect a new event as well. An example where I do this is when I want to hide a line while it is clicked. In the function that I connect to a button_press_event, I make the artist invisible, and I also create a lambda function that sets the visibility of that artist to True (and subsequently disconnects itself) and connect that lambda to a button_release_event. Keep in mind that these events are merely key'ed by strings like button_press_event, there is nothing magical about them. So, when you call the .process() function with a string value and an Event object, it passes that object to every connection that was made with that same string value. You can call the process() function from anywhere, even within an event. Now, I haven't tried connecting a generator function with a yield statement before, so I don't know how well that would work, but I don't know why it wouldn't. Why exactly would the callback registry not work for you? Ben Root -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Hardware rendering with tricontourf
On Fri, Jan 27, 2012 at 10:06 AM, Howard how...@renci.org wrote: On 1/27/12 3:39 AM, Ian Thomas wrote: On 26 January 2012 19:36, Howard how...@renci.org wrote: I'm rendering some images with about 3.5 million triangles into a 512x512 png file using tricontourf. I'm running this in a virtual machine, and I'm pretty sure that there is no graphics rendering hardware being used. Is it possible, assuming the hardware was available, to make tricontourf use the rendering hardware? Will that happen by default? You are correct, there is no graphics hardware rendering. Rendering is controlled by the various matplotlib backends, and to my knowledge there are no backends currently available that use hardware rendering. There has been some work done on an OpenGL backend, but I am not sure of the status of this. The last time I checked it was pretty experimental. Perhaps someone involved with it can comment on its current status. Ian Thomas Ian Thanks very much for the reply. If it helps whoever is doing the OpenGL backend, I may be able to play with it a bit. Howard That would be the Glumpy project. http://code.google.com/p/glumpy/ As stated in an email response a while back, glumpy is intended to be a testbed for developing the OpenGL backend for future inclusion into matplotlib. Cheers! Ben Root -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
