You want to call "set_yscale('symlog')" on the axes.

Mike

On 08/19/2011 01:07 PM, Jonny Milliken wrote:
Hi,

I am having some trouble establishing how to use matplotlib.scale.SymmetricalLogScale() to draw a log scale on the positive and negative axis of a plot. Assuming of course that is the correct way to go about it

The code at the moment I am looking at goes something like this, with arbitrary data generated. I need SubplotHost for parasite axis later on.

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import matplotlib
import pylab
import numpy
from mpl_toolkits.axes_grid.parasite_axes import SubplotHost

fig = pylab.figure(1)
main = SubplotHost(fig,111)
fig.add_subplot(main)

x,y = []
for i in range(100):
y.append(numpy.random.rand())
y.append(-numpy.random.rand())
y.append(numpy.random.rand() * 100)
y.append(-numpy.random.rand() * 100)

x = range(len(y))

main.plot(x,y)

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At this point I was expecting to be able to run with SymmetricalLogScale in the same way main.set_yscale('log') transforms after the plot but could not work out how to transform it other than:

<><><>
main.yaxis = matplotlib.scale.SymmetricalLogScale(main.yaxis)
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But that obviously didnt work, since SymmetricalLogScale doesnt have get_scale

If anyone could shed some light on the way to invoke this I'd be much obliged!? I havent been able to find an example of it's usage anywhere

Cheers

Jonny
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