[Matplotlib-users] Changing alpha channel of image in pylab
Hi! Changing the alpha-channel of a plotted image doesn't work for me in an ipython (pylab) shell. The example below illustrates the problem (i hope so at least ...) Running it with %run - everything is fine and the two images look the same. Runing it line by line without the show, the figure shows up, the images are plotted, but the alpha-value of im1 is not set correctly so it's fully opaque in the left plot. Is it just me or is it a bug, and if it's a bug is it a bug in pylab or in matplotlib? Thanks in advance! Jochen Code: import numpy as np from matplotlib.pyplot import * aimg = np.array([[0, 1, 1, 0], [0, 1, 2, 0], [0, 1, 3, 0], [0, 1, 4, 0]]) figure() ax = subplot(121) im1 = imshow(aimg, alpha = 1, interpolation='nearest') im1.set_alpha(0.5) ax = subplot(122) im2 = imshow(aimg, alpha = 0.5, interpolation='nearest') show() -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] X11 Window information for plots
Ryan May wrote on 19.01.2011 16:00: On Wed, Jan 19, 2011 at 4:48 AM, Jochen Deibelejochen.deib...@ntnu.no wrote: todd rme wrote on 19.01.2011 04:40: The class, on the other hand, seems to be an application-specific description of what the role is within the application. I think this should probably be figure. Just an idea: What about exposing this (or maybe all) of the values in the api to be set dynamically by the user? Of course providing a useful default value as well. The thought behind is that it's hard to guess in what context the user wants to use the figure. And perhaps the user has 21 plots of some type and one which is different and he wants to treat differently. But at the same time - you also could do this if you adjust the window title. I'm not sure what the complete motivation behind all of this is, but if you just want to set the window title, that's already available: fig = plt.figure() fig.canvas.set_window_title(Look at me!) Thanks, but that's not the intention. Some windowmanager on X11 systems provide the possibility to manage windows due to some criteria. You can f.ex. force all windows of your browser to open minimized or always on top etc. As far as I understood the discussion it is about what information should be provided to make this kind of window-handling possible. Jochen -- Protect Your Site and Customers from Malware Attacks Learn about various malware tactics and how to avoid them. Understand malware threats, the impact they can have on your business, and how you can protect your company and customers by using code signing. http://p.sf.net/sfu/oracle-sfdevnl ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Bug in boxplot/mlab.prctile
Hi! I noticed that the boxplot function incorrectly calculates the location of the median line in each box. As a simple example, plotting the dataset [1, 2, 3, 4] incorrectly plots the median line at 3. I can confirm this. [..] I would suggest that mlab.prctile be fixed to conform to some one or other of these methods, rather than adding to the proliferation of approaches to quantile-calculation. Is there any motivation for always truncating to integer (other that it's quicker to type :-)? And I agree here. I also recently (before I noticed this thread) posted a bug report #3151034 [1] There is also documented, that the mlab.prctle function does not yield the same results as scipy.stats.scoreatpercentile. In addition to make the confusion complete matlab reports yet another result ... But I think at least matplotlib and the scipy-stats-package should agree. Jochen [1] http://sourceforge.net/tracker/?func=detailaid=3151034group_id=80706atid=560720 -- Jochen Deibele, PhD candidate, Dipl.-Ing. Department of Circulation and Medical Imaging Norwegian University of Science and Technology (NTNU) Phone: +47 728 28028 E-Mail: jochen.deib...@ntnu.no -- Protect Your Site and Customers from Malware Attacks Learn about various malware tactics and how to avoid them. Understand malware threats, the impact they can have on your business, and how you can protect your company and customers by using code signing. http://p.sf.net/sfu/oracle-sfdevnl ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
