On Wed, May 6, 2009 at 9:49 AM, Sebastian Pająk <spcon...@gmail.com> 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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