Re: [Matplotlib-users] possible bug with linestyle='steps'
Hi, I just installed matplotlib 0.99.0 and I see that this problem is still there. The command plot(a,ls='steps') is equivalent to plot(a,ls='steps-pre') and both cause the first value of the array to NOT be plotted. This is REALLY not what should happen when one plots an array with several values. It is fine if there is a custom option to make that behavior (like 'steps-pre'), but the default for ls='steps' or step(x,y) must be to have the first flat level at the level of the first entry (what the 'steps-post' does). The docstring now correctly describes the behavior, so that is good, but please please make the default steps be steps-post. Thanks, -- Paul On Jul 19, 2009, at 9:35 AM, John Hunter wrote: On Fri, Jul 17, 2009 at 5:15 PM, Paul Raypaul@nrl.navy.mil wrote: Ryan Krauss-2 wrote: RTFM: plot(t,y, drawstyle='steps-post') Actually, 'steps-pre' (which is the default) and 'steps-post' seem to have swapped definitions. Here is what the docs say: *where*: [ 'pre' | 'post' | 'mid' ] If 'pre', the interval from x[i] to x[i+1] has level y[i] If 'post', that interval has level y[i+1] If 'mid', the jumps in *y* occur half-way between the *x*-values. In fact both the default behavior and what you get with steps-pre are what SHOULD happen with steps-post. And steps-post (as you point out) does what should be the default behavior and that of steps-pre. I have filed a bug report on this, since it is very important that this work as expected. As the original poster pointed out, this used to work correctly but recently seems to have gotten broken. I am looking first at the behavior of plot with the drawstyle property set -- let's make sure this is correct before turning to the steps command, which just uses plot with the drawstyle set -- here is my test code import numpy as np import matplotlib.pyplot as plt fig = plt.figure() ax = fig.add_subplot(111) a = np.array([1,2,3,4,5]) styles = 'default' , 'steps' , 'steps-pre' , 'steps-mid' , 'steps- post' styles = 'steps' , 'steps-pre' for ls in styles: ax.plot(a, ls=ls, label=ls, lw=2) ax.legend(loc='upper left') plt.show() pre causes the step to rise on the x[i], post causes it to rise on x[i+1] and mid in the middle. This seems like the correct behavior. So it does look like the docstring for 'step' is incorrect, and I've changed it to read *where*: [ 'pre' | 'post' | 'mid' ] If 'pre', the interval from x[i] to x[i+1] has level y[i+1] If 'post', that interval has level y[i] If 'mid', the jumps in *y* occur half-way between the JDH -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Crosshairs
Hi, I see that scatter() has a variety of different symbols that you can choose from, and even a way to create your own custom markers. However, I can't figure out how to make a crosshair symbol (a plus with non-touching lines) as my marker, which I'd like to use to show the location of a star on an underlying image without obscuring the star itself. Graphically, I'd like a marker symbol that looks like this... | | | === === | | | Does anyone know how to pull this off? Thanks! -- Paul -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] possible bug with linestyle='steps'
Ryan Krauss-2 wrote: RTFM: plot(t,y, drawstyle='steps-post') Actually, 'steps-pre' (which is the default) and 'steps-post' seem to have swapped definitions. Here is what the docs say: *where*: [ 'pre' | 'post' | 'mid' ] If 'pre', the interval from x[i] to x[i+1] has level y[i] If 'post', that interval has level y[i+1] If 'mid', the jumps in *y* occur half-way between the *x*-values. In fact both the default behavior and what you get with steps-pre are what SHOULD happen with steps-post. And steps-post (as you point out) does what should be the default behavior and that of steps-pre. I have filed a bug report on this, since it is very important that this work as expected. As the original poster pointed out, this used to work correctly but recently seems to have gotten broken. Cheers, -- Paul -- View this message in context: http://www.nabble.com/possible-bug-with-linestyle%3D%27steps%27-tp23568959p24542440.html Sent from the matplotlib - users mailing list archive at Nabble.com. -- Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] DLL not found when importing pylab on Windows
Hi, A colleague of mine uses Python on Windows. When he upgraded to matplotlib 0.90 (from 0.82, I think) he started getting an import error when importing pylab. We tried many combinations and the only thing that fixed it was downgrading back to 0.82. We tried: python2.4 and python2.5 numpy 1.0.1 and 1.0.2 matplotlib 0.90 and 0.87.7 We got the same error with all of those combinations. The error message was an ImportError: DLL load failed, when doing from matplotlib._ns_transforms import *. It is the same problem that others reported earlier: http://www.mail-archive.com/matplotlib-users@lists.sourceforge.net/ msg02841.html All of our installs were from the .exe Windows binaries, not source compilations, and in all cases import numpy, numpy.test(1), and import matplotlib produced no errors. Note that we have not installed either Numeric or numarray, but we tried adding Numeric and it didn't help. Has anyone found a solution? We'd like to upgrade to a matplotlib later that 0.87.5 to get matplotlib.patches.Ellipse(). Thanks, -- Paul - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] DLL not found when importing pylab on Windows
On May 10, 2007, at 10:34 AM, Werner F. Bruhin wrote: What backend are you using? If you use wxPython then as of 0.87.? something you need to either use wxPython 2.6 Unicode or rename the following file: I'm not 100% sure. We certainly didn't intentionally use wxPython, since I don't even know what it is. The only packages we installed were python, numpy, and matplotlib. I think his backend is TkAgg, but I can't check since it was on my colleagues computer and he is on travel today. (All the rest of us us python/numpy/matplotlib on Macs or Linux and everything is fine with 0.90) I know there are a bunch of .pyd files in his matplotlib directory. Are those Windows DLL versions of packages? As far as I could tell the relevant one _ns_transforms.pyd is there, so I'm not sure why it is having trouble finding it (though I'm working from memory here). Cheers, -- Paul - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] DLL not found when importing pylab on Windows
On May 10, 2007, at 11:05 AM, Werner F. Bruhin wrote: Should you have a small matplotlib script which shows the problem I'll give it a try on my setup (XP or Vista with Python 2.5 and numpy. No need for a script. import pylab produces the error. If you are using Windows XP, Python 2.5, numpy 1.0.2, and matplotlib 0.90, then you have the same setup that is causing us the error. What other packages do you have installed. My guess is that there is some dependency we are not satisfying? Thanks for your help, -- Paul - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
