On Mon, Feb 22, 2010 at 3:42 PM, Jan Strube <curious...@gmail.com> wrote:
> Hi John,
> the attachment may not make it to the list. However, please run the modified
> test.py that I have attached.
> It requires the attached input file.
> Then change it to read the original input file.
> In my case:
> The broken case:
OK, at least now we are running the sample example :-)
The problem is that the LogFormatter has a default which is
"decadeOnly=True" and in the first case which "worked" three of the
tick locations coincidentally came down on decades (0, 1, 2 -> 1, 10,
100). In the case you were working with, only one of the ticks mapped
to the decade.
So for this case we want a locator that returns integers 0,1,2... that
will then get mapped via Eric's custom formatter to the 10^i formats.
Unfortunately, there is no easy way to set the locator for the
colorbar. An easy workaround *for this case* is to simply set the
tick locations
cb = plt.colorbar(format=LogFormatterHB(), ticks=[0,1,2])
but in general you may not know the decade span that you need. It
does all feel a bit kludgy. The problem as you noted in one of your
earlier posts is that the data is log scaled before being passed into
the PolyCollection and the fact that it is log scaled is then lost to
the colorbar. It seems everything would fit together more naturally
if we passed in raw scalar data to the PolyCollection and set the norm
to be colors.LogNorm, and then also set norm=colors.LogNorm on the
colorbar
I tried:
polycol = plt.hexbin(data['jetMomentum'][cut] / 1000,
data['deltaR'][cut],gridsize=50, norm=colors.LogNorm())
cb = plt.colorbar(norm=colors.LogNorm())
but this appears to be broken:
msie...@pinchiepie:Downloads> python test.py
Traceback (most recent call last):
File "test.py", line 29, in <module>
cb = plt.colorbar()
File "/home/msierig/dev/lib/python2.6/site-packages/matplotlib/pyplot.py",
line 1356, in colorbar
ret = gcf().colorbar(mappable, cax = cax, ax=ax, **kw)
File "/home/msierig/dev/lib/python2.6/site-packages/matplotlib/figure.py",
line 1103, in colorbar
cb = cbar.Colorbar(cax, mappable, **kw)
File "/home/msierig/dev/lib/python2.6/site-packages/matplotlib/colorbar.py",
line 690, in __init__
ColorbarBase.__init__(self, ax, **kw)
File "/home/msierig/dev/lib/python2.6/site-packages/matplotlib/colorbar.py",
line 242, in __init__
self.draw_all()
File "/home/msierig/dev/lib/python2.6/site-packages/matplotlib/colorbar.py",
line 260, in draw_all
self._config_axes(X, Y)
File "/home/msierig/dev/lib/python2.6/site-packages/matplotlib/colorbar.py",
line 332, in _config_axes
self.update_ticks()
File "/home/msierig/dev/lib/python2.6/site-packages/matplotlib/colorbar.py",
line 271, in update_ticks
ticks, ticklabels, offset_string = self._ticker()
File "/home/msierig/dev/lib/python2.6/site-packages/matplotlib/colorbar.py",
line 458, in _ticker
b = np.array(locator())
File "/home/msierig/dev/lib/python2.6/site-packages/matplotlib/ticker.py",
line 1173, in __call__
vmin = self.axis.get_minpos()
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