On Tue, Apr 24, 2012 at 12:21 AM, Tony Yu <tsyu80@...> wrote:
> On Mon, Apr 23, 2012 at 5:09 AM, jul tayon <jtayon@...> wrote:
>> Hello list
>> matplotlib website says this mailing is the prefered way to report
>> bug, so here I am :
>> System :
>> python ; 2.7.2+
>> matplotlib 1.1.0
>> ubuntu TLS amd64
>> matplotlib Backend : TkAgg
>> How to reproduce (on my pf)
>> Code Snippet :
>> import matplotlib
>> import matplotlib.pyplot as p
>> import random
>> y = random.randint(0,10000000)
>> p.plot( [ int( y * ( 1 - 0.0006)) , y])
>> Exected Result :
>> Cause ?
>> It stinks something like a rounding error on the float.
>> If it also happens in Qt/Gtk backend it might be a matplotlib bug, if
>> it is only in Tk then it is either a Tk or a TkAgg bug.
> Sorry, I'm not clear on what the bug is. Is the picture you link to the
> *expected* result or the result from *executing* the code snippet. There are
> some inconsistencies between the pic and the code (legend, time on xaxis, 3
> point in pic, title), so it's a bit unclear what you're referring to.
> If you're talking about the offset value added to the y-axis, it's actually
> not a bug; it's a feature (usually that's a joke, but in this case, I'm
> This feature is useful when you have large numbers that vary over small
> ranges. Maybe it's not so bad in your example, but for larger numbers with
> smaller ranges (see code snippet below), it's quite helpful. I thought there
> was an rc parameter to tweak the value for using offsets, but I can't seem
> to find it. Below I create a custom tick formatter and turn offsets. There
> may be a better way to do this.
With recent mpl you can use the ticklabel_format pyplot function or axes method.
> If this isn't the bug you were suggesting, please clarify.
> import matplotlib.pyplot as plt
> fig, ax = plt.subplots()
> # or `ax = plt.gca()` for older versions of matplotlib
> y = 1e9
> ax.plot([y, y+1])
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