Re: [Matplotlib-users] Lines drawn across NaN data
I worked around this using masked arrays from numpy.ma. import numpy.ma as ma import pylab as pl import numpy as np x = ... x = ma.masked_where(np.isnan(x), x) pl.plot(x) pl.show() On Wed, Sep 17, 2008 at 6:36 PM, Goyo [EMAIL PROTECTED] wrote: I'm having trouble plotting data with NaN values. My plot has lines and markers and usually both are skipped for NaN values. But when I have more than 127 data a line is drawn from the last non-NaN to the next. I read somewhere about a similar issue (maybe here? sorry I can't find it just now), it seems like it has to do with some optimization performed for large datasets and the use if lineto instead of moveto or something like that. It was supposed to be fixed in 0.98.2 but I'm using 0.98.3 from Benjamin Drung's PPA (http://ppa.launchpad.net/bdrung). This code shows the difference between plotting 127 and 128 data (look at the left of each figure): import pylab as pl x = pl.random(128) x[4:7] = pl.NaN y = x[:-1] pl.figure(1) pl.plot(x, '-o') pl.grid(True) pl.figure(2) pl.plot(y, '-o') pl.grid(True) pl.show() Is this a known issue? Is there any workaround? Thanks Goyo - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Lines drawn across NaN data
Tanks, Michael. Maybe I'll try to build from SVN this weekend. Goyo El jue, 18-09-2008 a las 09:31 -0400, Michael Droettboom escribió: Proper NaN handling has been a long and winding road. This particuar bug you're running into was fixed about a week *after* the 0.98.3 release. Here's the patch: http://matplotlib.svn.sourceforge.net/viewvc/matplotlib?view=revrevision=6018 So SVN trunk currently works. The patch against 0.98.3 is non-trivial -- there were actually many changes throughout the code to make all this work, so there isn't an easy workaround, and in any case requires a recompile. If you can build from SVN, that's what I would suggest -- otherwise wait for the 0.98.4 release (I don't believe we have an ETA on that, yet). Cheers, Mike Goyo wrote: I'm having trouble plotting data with NaN values. My plot has lines and markers and usually both are skipped for NaN values. But when I have more than 127 data a line is drawn from the last non-NaN to the next. I read somewhere about a similar issue (maybe here? sorry I can't find it just now), it seems like it has to do with some optimization performed for large datasets and the use if lineto instead of moveto or something like that. It was supposed to be fixed in 0.98.2 but I'm using 0.98.3 from Benjamin Drung's PPA (http://ppa.launchpad.net/bdrung). This code shows the difference between plotting 127 and 128 data (look at the left of each figure): import pylab as pl x = pl.random(128) x[4:7] = pl.NaN y = x[:-1] pl.figure(1) pl.plot(x, '-o') pl.grid(True) pl.figure(2) pl.plot(y, '-o') pl.grid(True) pl.show() Is this a known issue? Is there any workaround? Thanks Goyo - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Lines drawn across NaN data
I'm having trouble plotting data with NaN values. My plot has lines and markers and usually both are skipped for NaN values. But when I have more than 127 data a line is drawn from the last non-NaN to the next. I read somewhere about a similar issue (maybe here? sorry I can't find it just now), it seems like it has to do with some optimization performed for large datasets and the use if lineto instead of moveto or something like that. It was supposed to be fixed in 0.98.2 but I'm using 0.98.3 from Benjamin Drung's PPA (http://ppa.launchpad.net/bdrung). This code shows the difference between plotting 127 and 128 data (look at the left of each figure): import pylab as pl x = pl.random(128) x[4:7] = pl.NaN y = x[:-1] pl.figure(1) pl.plot(x, '-o') pl.grid(True) pl.figure(2) pl.plot(y, '-o') pl.grid(True) pl.show() Is this a known issue? Is there any workaround? Thanks Goyo - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
