Dear developers, the following example shows a somewhat unexpected behaviour of the get_xlim() method of an axis object: it returns a view to the internal data structure used to store the data limits. Because of this saving and restoring the data limits failed in this example (I am using matplotlib 0.98.3):
from pylab import * plot([0,1], [0,1]) #create some plot ax = gca() #keep reference to axis #after some time, I want to change the plot content, but keep the data limits xlimits = ax.get_xlim() #save limits print xlimits ax.clear() #first clear axis, then plot([1,2], [1,2]) #create new plot content ax.set_xlim(xlimits) #does _not_ restore old limits print xlimits #since saved xlimits also changed Now I know that I have to use xlimits = ax.get_xlim().copy() if I want to save the data limits. Is this really an intended behaviour? Wouldn't it be better if get_xlim() already returns a copy? Or could at least the documentation be updated to mention this pitfall? Gregor ------------------------------------------------------------------------- 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=100&url=/ _______________________________________________ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
