John Hunter wrote: > On Tue, Aug 5, 2008 at 7:03 PM, Eric Firing <[EMAIL PROTECTED]> wrote: > >> Matlab ignores it, same as with a nan. > > Although intuitively I think of inf as very different from nan, my > default is to go with matlab like behavior in the absence of > compelling a argument otherwise. I won't be providing that argument > for isnan/inf, so if someone wants mpl to behave differently, step up > and argue why. > >> This needs a bit of thought and checking. Mike went to some trouble, I >> believe, to make nans work without running everything through masked >> arrays--whether this is actually *faster* than doing an initial masking >> operation when needed and then using masked arrays everywhere internally >> when bad values are present, I don't know. It is possible that everything >> could be made to work with infs simply by changing all "isnan(x)" to >> "~isfinite(x)", which has the advantage of being slightly faster >> (surprisingly) as well as more general. > > Perhaps we should centralize this functionality to a cbook analogue of > "is_string_like" or "iterable" called "is_plottable" or something to > that effect. That way, people writing plotting functions will not > have to decide if the inclusion criteria is isnan or ~isinfinite, but > instead can simply rely on the cbook function (with a moderate > performance hit for the extra function call). We will likely need a > version for a single axis (x or y) as well as for points ( (x,y) > tuples) -- these ideally will support scalar or array inputs, or we > can provide array versions of each. There are only a few modules > using isnan currently (axes, contour, mlab and path) so it would not > be too difficult to centralize this functionality. Do you want to > take the lead on this one, Eric?
Yes, but I think that the cbook approach is overkill in this case, and counterproductive. Maybe I should add a bit to the coding guide, but we really don't need another wrapper just to handle nans and infs. I think I see how to fix everything, and improve speed, with only a few changes, including a couple in src. Eric ------------------------------------------------------------------------- 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-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
