Re: [Matplotlib-users] ylim() efficiency

[Daniel Wheeler]

Thanks for the detailed reply. I was just wondering whether I was missing something obvious and that doesn't seem to be the case. Cheers Daniel Wheeler On Aug 2, 2006, at 2:15 PM, John Hunter wrote: "Daniel" == Daniel Wheeler <[EMAIL PROTECTED]> writes:     Daniel>    It seems that resetting the axes limits every time data     Daniel> needs to be redisplayed is rather inefficient.  A script     Daniel> is included with this mail that tests the efficiency of     Daniel> resizing the y axis.  The script has two loops, in the     Daniel> first loop pylab.ylim() is continuously called with the     Daniel> changing size of the domain, in the second loop     Daniel> pylab.ylim() is not called inside the loop. The first loop     Daniel> takes roughly twice as long to perform.  Is this an     Daniel> unavoidable cost for resizing the y axis or is there     Daniel> another way to resize the axis that is less costly than     Daniel> using ylim()? The cost from the tick layout and formatting -- this could be made more efficient but that is where the cost is currently.  For every tick label, matplotlib does a layout assuming you may have passed a rotated multiline string.  Special casing the no newline, non-rotated case is probably where the biggest win would come from.  It is a good project for someone to tackle, but the text layout code is kind of hairy because it deals with so many cases: mathtext, usetex, rotated strings, multiline strings, top/bottom left/right alignment, and so on. A complete refactoring of ticks to treat them as a single collection-like object rather than a bunch of independent objects would also help a lot here. JDH Daniel Wheeler

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