Re: [Matplotlib-users] Equal decades on loglog axes

[Sebastian P. <spc...@gm...>]

Thanks a lot!. I don't understand it but It works now as it should.


2009/5/6 Jae-Joon Lee <lee...@gm...>:
> On Wed, May 6, 2009 at 9:49 AM, Sebastian Pająk <spc...@gm...> wrote:
>> Hello
>>
>> How can I set decade on log x axis to be equal length to decade on log
>> y axis (physically)?
>>
>> If I make:
>>
>> ax.set_xscale("log")
>> ax.set_yscale("log")
>> ax.set_aspect(1)
>>
>> I get it all wrong, the units are equal, not decades!!
>>
>> I need the same effect as I get in Gnuplot - the square decades:
>>
>> set logscale yx;
>> set size ratio -1;
>>
>> How can I do it in matplotlib?
>>
>
>
> I'm afraid that this is not directly supported by the matplotlib,
> although I think it should.
> However, you can do it with some monkey patching (or with some other
> similar way).
>
>
> import math
>
> def get_data_ratio(self):
>    xmin,xmax = self.get_xbound()
>    ymin,ymax = self.get_ybound()
>
>    if self.get_xscale() == "log" and self.get_yscale() == "log":
>        xsize = max(math.fabs(math.log10(xmax)-math.log10(xmin)), 1e-30)
>        ysize = max(math.fabs(math.log10(ymax)-math.log10(ymin)), 1e-30)
>    else:
>        xsize = max(math.fabs(xmax-xmin), 1e-30)
>        ysize = max(math.fabs(ymax-ymin), 1e-30)
>
>    return ysize/xsize
>
> from matplotlib.axes import Axes
> Axes.get_data_ratio = get_data_ratio
>
>
> ax = gca()
>
> ax.set_xscale("log")
> ax.set_yscale("log")
> ax.set_aspect(1.)
>
> ax.set_xlim(1, 100)
> ax.set_ylim(1, 1000)
>
>
>
> John and others,
> How do you think this being a default behavior?
>
> Regards,
>
> -JJ
>
>
>
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