This is the result of a change that I committed in between 0.90.0 and 0.90.1 - sorry if it caused confusion...
The idea is exactly what you observed: legend() only displays those lines that have an explicit label set. If a certain line in a figure does not have a label, I think it is rather pointless displaying it in a legend at all. I mean - the legend is meant to explain the individual lines and the default labels like "line0" can hardly be counted as "explanation". Maybe, though, there should be one additional condition: * If no lines or patchsets have explicit labels, display all defaults. * If any line or patch has an explicit label, display only the explicit labels. This would probably avoid confusion about a completely empty legend. What do you think? Greetings, Norbert Jonathan Griffitts wrote: > In matplotlib 0.90.1 the behavior of legend() seems to have changed. > > Here's a test code fragment: > --------------------------- > import pylab > import numpy > > y=numpy.arange(-10,10)**2 > print y > pylab.plot(y) > pylab.legend() > pylab.show() > --------------------------- > Running on python 2.5.1, matplotlib 0.90.0 gives me a reasonable-looking > legend in upper right corner with label "line0". > > matplotlib 0.90.1 gives an empty rectangular box, fairly large, right in > the middle of the plot. > > Attempting to move the legend with loc=2 or whatever has no effect. > However, giving an explicit label ( pylab.legend(['line1']) ) makes it > start working the same as 0.90.0. > > I started looking at the source but don't have time today to understand > how this is supposed to work. Maybe later. > > > > Is this the intended behavior? The announcement for 0.90.1 says: > "Display only meaningful labels when calling legend() without args." > It's not clear to me what this means. > > ------------------------------------------------------------------------- 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
