Re: [Matplotlib-users] Histogram align 'edge' or 'center' bug?
On Sun, 2007-04-08 at 19:25 +0200, David Fokkema wrote: On Fri, 2007-04-06 at 18:32 +0300, Jouni K. Seppänen wrote: David Fokkema [EMAIL PROTECTED] writes: If I choose center, the result is that my histogram is calculated for edge values but the bars are placed at center values which is completely misleading and wrong! I'd say this is a bug, but I may be overlooking something here... Looks like a bug to me. Could you file it at http://sf.net/tracker/?group_id=80706atid=560720 so it isn't forgotten? Well... It couldn't be too hard to fix, I guess... I know python, I tracked down the source, I could try and fix it, right? I think I'll have the time next Tuesday, so hopefully I'll file a bug report with an attached patch, ;-) I fixed the bug, I think. At least it's working on my system and I think it is not invasive. Comments please? I'll send it upstream otherwise... --- matplotlib/axes.py.orig 2007-04-10 10:58:30.0 +0200 +++ matplotlib/axes.py 2007-04-10 11:14:56.0 +0200 @@ -4149,7 +4149,7 @@ hist bars if not self._hold: self.cla() -n, bins = matplotlib.mlab.hist(x, bins, normed) +n, bins = matplotlib.mlab.hist(x, bins, normed, align) if width is None: width = 0.9*(bins[1]-bins[0]) if orientation == 'horizontal': patches = self.barh(bins, n, height=width, left=bottom, align=align) --- matplotlib/mlab.py.orig 2007-04-10 11:16:23.0 +0200 +++ matplotlib/mlab.py 2007-04-10 11:24:48.0 +0200 @@ -597,7 +597,7 @@ #S = -1.0*asum(p*log(p)) return S -def hist(y, bins=10, normed=0): +def hist(y, bins=10, normed=0, align='edge'): Return the histogram of y with bins equally sized bins. If bins is an array, use the bins. Return value is @@ -626,11 +626,16 @@ dy = (ymax-ymin)/bins bins = ymin + dy*arange(bins) +if align == 'center': + hw = .5*(bins[1]-bins[0]) + nbins = [x-hw for x in bins] +else: + nbins = bins -n = searchsorted(sort(y), bins) +n = searchsorted(sort(y), nbins) n = diff(concatenate([n, [len(y)]])) if normed: - db = bins[1]-bins[0] + db = nbins[1]-nbins[0] return 1/(len(y)*db)*n, bins else: return n, bins Thanks, David - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Reuse or clone axes / figure / ??? from basemap for time series plot
John Hunter schrieb: On 4/4/07, Simon Kammerer [EMAIL PROTECTED] wrote: Hi list, I guess it's not limited to the basemap toolkit, but it fits to explain my problem: I'd like to produce time series with basemap. As drawing coastlines, countrys etc. is expensive, but stays the same for every time step, I'd like to draw the basemap background only once and the reuse I. This can probably be solved with the copy/blit/animate stuff described at the end of http://www.scipy.org/Cookbook/Matplotlib/Animations Doesn't work for me, as I don't want to use a GUI but save my plots as images. blit() raises an error: AttributeError: 'FigureCanvasGTKAgg' object has no attribute '_pixmap' Probably because the FigureCanvasGTK part of FigureCanvasGTKAgg is not initialized?! I guess I need blit() implemented in FigureCanvasAgg, but to my understanding of the animation/blitting stuff, this is probably not how lowlevel figurecanvas like FigureCanvasAgg work, as they are vector based. I solved my initial problem with a kind of very simple coastlines-cache in the basemap toolkit. I will discuss my changes with Jeff Whitaker, maybe they will find their way into basemap eventually... Simon - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Translating ticks a la MultipleLocator ?
I think this is a trivial question.. If there are a set of data points being plotted in a subplot, say 0 to 1000 points; the subplot displays the ticks as 0 to 1000 points and it is desired to translate those points to 0 t0 250 points on the subplot display - with point 0 mapping to point 0, point 250 mapping to point 2 and so on, what could be the best way to do this ? Just curious, thanks, iyer Never miss an email again! Yahoo! Toolbar alerts you the instant new Mail arrives. http://tools.search.yahoo.com/toolbar/features/mail/ - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Translating ticks a la MultipleLocator ?
Not sure if I understand, but I think this is what you want to do: y = rand(1000) # your 1000 random points x = linspace(0, 250, y.size) plot(x,y) /A Iyer wrote: I think this is a trivial question.. If there are a set of data points being plotted in a subplot, say 0 to 1000 points; the subplot displays the ticks as 0 to 1000 points and it is desired to translate those points to 0 t0 250 points on the subplot display - with point 0 mapping to point 0, point 250 mapping to point 2 and so on, what could be the best way to do this ? Just curious, thanks, iyer Never miss an email again! Yahoo! Toolbar alerts you the instant new Mail arrives. http://tools.search.yahoo.com/toolbar/features/mail/ - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Histogram align 'edge' or 'center' bug?
David Fokkema [EMAIL PROTECTED] writes: I fixed the bug, I think. At least it's working on my system and I think it is not invasive. Comments please? I'll send it upstream otherwise... Does this handle the case where the user has specified bins of different widths? It looks like you are only using the width of the first bin: +if align == 'center': + hw = .5*(bins[1]-bins[0]) + nbins = [x-hw for x in bins] +else: + nbins = bins At least, I've always thought that unequal bins are allowed, but from the following it seems that the probability density support also makes an incompatible assumption: if normed: - db = bins[1]-bins[0] + db = nbins[1]-nbins[0] return 1/(len(y)*db)*n, bins -- Jouni K. Seppänen http://www.iki.fi/jks - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Translating ticks a la MultipleLocator ?
Thanx for the response.. I'd like to avoid the pylab interface... linspace is good. assume you have 1000 points of data and you'd like the ticks to display from 0 to 4, since the 1000 points of data were sampled at 250 Hz. any non-pylab ideas ? Indexlocator? -iyer --- Antonio Gonzalez [EMAIL PROTECTED] wrote: Not sure if I understand, but I think this is what you want to do: y = rand(1000) # your 1000 random points x = linspace(0, 250, y.size) plot(x,y) /A Iyer wrote: I think this is a trivial question.. If there are a set of data points being plotted in a subplot, say 0 to 1000 points; the subplot displays the ticks as 0 to 1000 points and it is desired to translate those points to 0 t0 250 points on the subplot display - with point 0 mapping to point 0, point 250 mapping to point 2 and so on, what could be the best way to do this ? Just curious, thanks, iyer Never miss an email again! Yahoo! Toolbar alerts you the instant new Mail arrives. http://tools.search.yahoo.com/toolbar/features/mail/ - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users Sucker-punch spam with award-winning protection. Try the free Yahoo! Mail Beta. http://advision.webevents.yahoo.com/mailbeta/features_spam.html - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Histogram align 'edge' or 'center' bug?
On Tue, 2007-04-10 at 16:13 +0300, Jouni K. Seppänen wrote: David Fokkema [EMAIL PROTECTED] writes: I fixed the bug, I think. At least it's working on my system and I think it is not invasive. Comments please? I'll send it upstream otherwise... Does this handle the case where the user has specified bins of different widths? It looks like you are only using the width of the first bin: +if align == 'center': + hw = .5*(bins[1]-bins[0]) + nbins = [x-hw for x in bins] +else: + nbins = bins I am only using the first width, indeed. If different widths are allowed (and why not?) some more coding has to be done. On the other hand, I use align = 'center' because I have a detector which samples timing information at 20 ns intervals. So, when binning timing information, I only have 0, 20 ns, 40 ns, 60 ns and so forth. Being able to specify those values as the center of my bin instead of calculating edges myself (-10, 10, 30, 50, etc.) is very useful. I can't think of an application where you have bins of different widths and you want to center the values... Furthermore, when plotting the histogram, the function calculates the width of the bars only for the first bin and uses that for all bars. So I think this function is highly unstable when you use variable sized bins. Matplotlib.mlab.hist only calculates the histogram and can only use variable sized bins when you want a simple histogram. Maybe add something to this effect in the docstring? At least, I've always thought that unequal bins are allowed, but from the following it seems that the probability density support also makes an incompatible assumption: if normed: - db = bins[1]-bins[0] + db = nbins[1]-nbins[0] return 1/(len(y)*db)*n, bins It does... David - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Translating ticks a la MultipleLocator ?
I apologize if I haven't been sufficiently clear. While your suggestion picks out the samples from the sample set, and discards other samples - what I was looking at -- when I plot a sample set, of say - 1000 points, the xticks shows up as 0 to 1000 points on the plot. I was wondering if there could be a way to translate the xtick display to that of seconds, if the sampling frequency is 250 Hz, the plot would still display the original data set, but with different xticks -- for e.g. it would display xticks as 0 to 4 seconds rather than 0 to 1000 points.. hence is there a good way to translate ticks ? -iyer --- John Hunter [EMAIL PROTECTED] wrote: On 4/10/07, Iyer [EMAIL PROTECTED] wrote: I'd like to avoid the pylab interface... linspace is good. from matplotlib.mlab import linspace But linspace may not be what you want. Probably better: In [1]: Fs = 4. # sampling at 4Hz In [2]: dt = 1./Fs In [3]: import numpy In [4]: ind = numpy.arange(1000.) # the sample number In [5]: t = ind*dt # the sample times In [6]: t[0] Out[6]: 0.0 In [7]: t[1] Out[7]: 0.25 linspace gives a slightly different answer, because it includes the endpoint. Sometimes this is what you want, sometimes not. The fish are biting. Get more visitors on your site using Yahoo! Search Marketing. http://searchmarketing.yahoo.com/arp/sponsoredsearch_v2.php - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Translating ticks a la MultipleLocator ?
On 4/10/07, Iyer [EMAIL PROTECTED] wrote: I apologize if I haven't been sufficiently clear. While your suggestion picks out the samples from the sample set, and discards other samples - what I was looking at -- when I plot a sample set, of say - 1000 points, the xticks shows up as 0 to 1000 points on the plot. I was wondering if there could be a way to translate the xtick display to that of seconds, if the sampling frequency is 250 Hz, the plot would still display the original data set, but with different xticks -- for e.g. it would display xticks as 0 to 4 seconds rather than 0 to 1000 points.. hence is there a good way to translate ticks ? Yes, you can certainly do this, but what we are suggesting is that it makes more sense to simply scale your data before plotting. Is there a reason you don't want to do this ax.plot(ind*dt, y) The index locator JDH - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Translating ticks a la MultipleLocator ?
Wouldn't it make sense to simply change the xticks to reflect the time instead of the number of data points ? Like, if we needed to display 0 t0 1000 points over a period of time, wouldn't it be nice to translate the xticks to reflect the period of time ? Would you suggest using IndexLocator in that sense ? -iyer hence is there a good way to translate ticks ? Yes, you can certainly do this, but what we are suggesting is that it makes more sense to simply scale your data before plotting. Is there a reason you don't want to do this ax.plot(ind*dt, y) The index locator JDH Looking for earth-friendly autos? Browse Top Cars by Green Rating at Yahoo! Autos' Green Center. http://autos.yahoo.com/green_center/ - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] problems building/installing
Hello Simon- I have experimented with every conceivable python/numpy/mpl permutation on mac os and I will second Chris Barker's recommendation. Use the pythonmac.org packages with the wx backend. Choose whichever version of wx and python that is best supported my the mpl version. I use mpl v 0.87, wx 2.6. and python 2.4 on my ppc mac. -stephen On 4/5/07, Christopher Barker [EMAIL PROTECTED] wrote: Simson Garfinkel wrote: I'm embarrassed to ask that I'm having trouble building/installing matplotlib on an intel Mac. Don't be embarassed -- it's really pretty hard! All the various pythons (Universal, fink, darwinports, etc) for OS-X confuse things a lot, but I think you'll get the best support if you stick with the official framework Universal build: http://www.python.org/download/ You can also get it from: http://www.pythonmac.org/packages/py25-fat/index.html The cool thing about that site is that you can get a bunch of pr-built compatible packages from there also. Unfortunately, the matplotlib there right now doesn't appear to work with the latest wxPython. I'm not sure which wxPython version it is built against, but it crashed for me when used with wxPython2.8.3 The good news is, as I understand it, is the Ken McIvor patched the most recent MPL to use wxPython 2.8b features that allow you to build MPL without linking to wxPython. Hopefully someone will do a build that works with wxPython2.8.3 and put it up on the pythonmac site soon. I may even do it, but I haven't needed to for a while, so I don't have it all set up at this point. If you're going to built it yourself, still use the pythonmac packages for everything else, you'll be glad you did. -Chris - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] problems building/installing
Stephen Uhlhorn wrote: I have experimented with every conceivable python/numpy/mpl permutation on mac os and I will second Chris Barker's recommendation. Use the pythonmac.org packages with the wx backend. Choose whichever version of wx and python that is best supported my the mpl version. I use mpl v 0.87, wx 2.6. and python 2.4 on my ppc mac. I think mpl 9.0, python 2.5 and wx 2.6 will work OK too. I'm working right now on getting a version that will work well with wxPython2.8 -- but I'm not there yet. -Chris -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/ORR(206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception [EMAIL PROTECTED] - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Translating ticks a la MultipleLocator ?
On 4/10/07, John Hunter [EMAIL PROTECTED] wrote: On 4/10/07, Iyer [EMAIL PROTECTED] wrote: I apologize if I haven't been sufficiently clear. While your suggestion picks out the samples from the sample set, and discards other samples - what I was looking at -- My suggestion does not discard other samples, so you may not be understanding what I am saying. Perhaps you can try the suggested code and see if it does what you want. My example plots all the samples; it simply scales the xaxis to represent time and not sample number. - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Histogram align 'edge' or 'center' bug?
David Fokkema [EMAIL PROTECTED] writes: I can't think of an application where you have bins of different widths and you want to center the values... Actually, now that I think about it, there is not enough information in the bin centers to know the widths of the bins if they may vary. For example, if your bin edges are (2, 4, 8, 16, 32) or (1, 5, 7, 17, 31), you get the same bin centers (3, 6, 12, 24). Perhaps it's best to disallow variable-width bins when align='center'. -- Jouni K. Seppänen http://www.iki.fi/jks - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Translating ticks a la MultipleLocator ?
There seems to be a huge misunderstanding here, and I am not sure what it is, but what you need to do is run examples and experiment with variations until you have some inkling of what mpl is actually doing. Start with http://matplotlib.sourceforge.net/tutorial.html. Please note that the ticks are simply labeled locations--they have no effect on what data are plotted. When you do ax.plot(ind*dt, y), absolutely *nothing* is lost; every value of y in your array is plotted. mpl is plotting (x,y) pairs--all of them--and labeling the axes accordingly. To see what is being plotted, you can use plot(x,y,'ro'), for example, to plot each point as a red circle. Experiment with this. Don't worry right now about avoiding the pylab interface; take advantage of its simplicity to get the most basic plotting concepts straightened out via quick experimentation. Use the gui zoom button to see how axis labeling works. Make your own simple examples; plot random points, plot sin waves. Eric Iyer wrote: It is not what I need.. http://matplotlib.sourceforge.net/matplotlib.axes.html The plot method (plot(self, *args, **kwargs)) accepts only x,y pairs, in ax.plot(ind*dt, y) -- the x parameter is ind*dt - the sample times, but the data between the sample points is lost. IMHO, the likely way to prevent loss of sampled data points is changing the ticks, isn't that possible to change the ticks, while keeping the data as it is -- plotted as if it were for a number of data points. -iyer --- John Hunter [EMAIL PROTECTED] wrote: On 4/10/07, John Hunter [EMAIL PROTECTED] wrote: On 4/10/07, Iyer [EMAIL PROTECTED] wrote: I apologize if I haven't been sufficiently clear. While your suggestion picks out the samples from the sample set, and discards other samples - what I was looking at -- My suggestion does not discard other samples, so you may not be understanding what I am saying. Perhaps you can try the suggested code and see if it does what you want. My example plots all the samples; it simply scales the xaxis to represent time and not sample number. Looking for earth-friendly autos? Browse Top Cars by Green Rating at Yahoo! Autos' Green Center. http://autos.yahoo.com/green_center/ - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] AttributeError: LineCollection instance has no attribute 'get_lines'
Ted Drain wrote: John, One of the problems we've had is trying to design an auto-scaling algorithm that works well with any type date format since the date strings can be so large horizontally. I believe that having the draw time elements be able to query the renderer for things would help this out tremendously since we could then have the tick generator space out the dates along nice boundaries without overlapping the date strings. This is only half of the solution; the other half is controlling the order in which things are done. In its most general form, this would involve some sort of dependency tree, automatically generated. I imagine this is how layout engines work. I know that Andrew contributed one quite some time ago, and so far I have done nothing with it. (Sorry, Andrew.) A simpler mechanism suggested by John was a set of pre- and post- hooks in draw functions that would enable one to manually put in dependencies and ensure that dependent calculations are done in the right order. In all of this, it is critical to avoid chicken-and-egg situations: e.g., label font size depends on physical room available, but tick spacing adjusts to accommodate the labels. The transforms module already does part of what we are talking about here; dependency information is accumulated as BinOps are built from other BinOps, and everything is resolved at rendering time. I think that any changes like this need to wait in line behind the upcoming numpyfication, and it would be nice to have some full outlines of alternative strategies before picking one and proceeding. Ideas and strategy sketches tend to get lost in the email stack; would it help to have a wiki page for discussion of major design questions like this? Or is this overkill? Eric Ted At 01:07 PM 4/7/2007, John Hunter wrote: On 4/7/07, Eric Firing [EMAIL PROTECTED] wrote: I put back get_lines() in collections and fixed a related bug in legend, so the test script now works in the sense that it makes a legend. It puts in an unlabeled line, presumably corresponding to the line collection making up the error bars. Maybe legend provides a way to avoid this. I haven't looked. If I'm understanding the problem you are describing correctly, it looks like _nolegend_ needs to be set here. For artists we do not want to be included in the legend, the label should be set to '_nolegend_' and legend will ignore it in auto-legending. Or at least it should and if it is not it is a bug. The larger problem, and the one that probably made me yank get_lines (without realizing the legend code was using it--my mistake--I do try to check for things like that) is that legend really wants to know the draw-time locations of all plot elements, and for collections (among other things) this cannot be determined in general. The collection get_lines and get_verts methods can give the right answer to legend only if the data and offset transforms are the same. Sometimes they are, sometimes they are not. LineCollection.get_lines() probably could be improved to do a better job than at present, but never a perfect one. One approach is to make every artist provide a get window extent which returns a bounding box. There is the issue of how to get the renderer before draw time, but we could fix this. It would be nice for draw time layout algorithms to be able to assume this method, and a few objects already provide it, eg text. This is an example of a more widespread problem that we have thought about and discussed (including some good ideas from John, of course), but solving it is not simple. For the time being, at least, we are stuck with some imperfections. In any case, thanks for bringing the legend/LineCollection bug to my attention. This is the sort of thing it is nice to get cleaned up before the next release, coming soon. Do you know of some other simple bugs like this we should look at ASAP? I added unit/legend_unit.py script to create legends using a scatter and vlines, which create RegPolyCollections and LineCollections. We should use more stuff like this in general, unit scripts which exercise the more arcane usages. JDH - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] AttributeError: LineCollection instance has no attribute 'get_lines'
On 4/10/07, Eric Firing [EMAIL PROTECTED] wrote: Ideas and strategy sketches tend to get lost in the email stack; would it help to have a wiki page for discussion of major design questions like this? Or is this overkill? My preference is for (possibly structured) text documents in the svn repo, ala CODING_GUIDE - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Gnome problem when plotting with mpl
Hi, a problem that I have since some time now using mpl: everytime I start plotting, I get something like: (python:6374): GnomePrintCupsPlugin-WARNING **: iconv does not support ppd character encoding: ISOLatin1, trying CSISOLatin1 I know this is not really a mpl problem, but if anybody has a clue, it is welcome! cheers Eric matplotlib version 0.87.7 verbose.level helpful interactive is False platform is linux2 numerix numpy 1.0.2.dev3534 font search path ['/usr/local/lib/python2.4/site-packages/matplotlib/mpl-data'] backend WXAgg version 2.6.2.1 Python 2.4.2 (#1, May 2 2006, 08:13:46) on Suse 10.1. - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Translating ticks a la MultipleLocator ?
On 4/10/07, Iyer [EMAIL PROTECTED] wrote: If only someone could guide me, so that I can understand better how to translate the ticks from the default number of sample ticks to that of different ticks - say new_ticks=original_ticks/(some_constant). Right now I'm clueless, your input will help a lot in understanding Mpl. OK, your persistence is admirable. You are still asking the wrong question and applying the wrong solution, but dog-golly, you've earned the right to do it the wrong way! from matplotlib.ticker import FuncFormatter def myformatter(x, pos=None): return '%1.3f'%(x/4.) ax = subplot(111) ax.plot(x, y) ax.xaxis.set_major_formatter(FuncFormatter(myformatter)) Now all your ticks are magically divided by 4. But really, simply scaling your x input data is the way to go. If we want to move this conversation forward, you should try instead plot(x/4, y) and then explain as clearly as possibly this doesn't do what you want. - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] . Newbie. Interactive and saving plots to file
Just started using matplotlib (it's great!) interactively (using ipython, TkAgg backend) and am moving into saving plots to file. I edited the matplotlibrc to interactive: False and backend: Agg, and it works great. (produces .png) I would normally like to muck around interactively to get the plot right, then save it to png once I'm happy with it. The question is, do people wanting to do this have to edit the matplotlibrc and restart Python each time, or is there some other way? editorial: What a great combination is Python and matplotlib! Thanks. UNITED GROUP This email message is the property of United Group. The information in this email is confidential and may be legally privileged. It is intended solely for the addressee. Access to this email by anyone else is unauthorised. If you are not the intended recipient, you may not disclose, copy or distribute this email, nor take or omit to take any action in reliance on it. United Group accepts no liability for any damage caused by this email or any attachments due to viruses, interference, interception, corruption or unauthorised access. If you have received this email in error, please notify United Group immediately by email to the sender's email address and delete this document.- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Translating ticks a la MultipleLocator ?
Iyer [EMAIL PROTECTED] writes: With all respect, I have certainly perused the tutorials before posting the question. From your postings it seems that you are misunderstanding some fundamental concepts, but it is not clear how. Can you write up a little piece of code showing what you are doing now, and explain how you would like the output changed? Just make up some data and plot it, and point out what is wrong about the result. As an example of how to phrase your question, here is how I would write the question I thought you were trying to communicate a few emails ago: -- The following script makes an otherwise good plot, but I want the x-axis to go from 0 to 1, not 0 to 10. How do I do this? x = arange(0,10,0.5) y = sin(x) plot(x,y) -- The best answer to *that* question, which you got from John Hunter, is to change the script to the following: x = arange(0,10,0.5) y = sin(x) dt = 1.0/10 plot(x*dt,y) Since you say that this does not solve your problem, that must not have been the question you intended to ask. Perhaps rephrasing the question using a code example would help make your point clearer. -- Jouni K. Seppänen http://www.iki.fi/jks - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
