Jouni K. Seppänen wrote:
> "Mika Orajärvi" <[EMAIL PROTECTED]> writes:
>
>> This code does seem to draw some kind of histogram but it would be
>> much more usefull to have at least the y-scale as logarithmic. But I
>> haven't found a way to make the scale logarithmic.
>
> According to the docstring of hist you can give it a keyword argument
> of log=True to make the y axis logarithmic. However there is a slight
> bug in that zero-height histogram bars like you have in your example
> cause log(0) to be computed. Here's a quick fix:
>
> ------------------------------------------------------------------------
> from pylab import *
> x=0.000925,0.000879,0.000926,0.00088,0.001016,0.000931,0.000927,0.00088,\
> 0.000926,0.000926,0.000879,0.0009
> n, bins = mlab.hist(x, 1000)
> width = 0.9 * (bins[1]-bins[0])
> nz = nonzero(n)
> bar(bins[nz], n[nz], width=width, log=True)
> grid(True)
> show()
> ------------------------------------------------------------------------
>
> If the devs agree that this is a bug in hist, I can fix it in svn.
>
I think it is already fixed. This works (drawing a sensible bar plot
with a log scale despite bins with zero):
In [3]:hist(rand(10), log=True)
Out[3]:
(array([1, 0, 3, 1, 0, 1, 2, 1, 0, 1]),
array([ 0.00863515, 0.10200932, 0.19538349, 0.28875767, 0.38213184,
0.47550601, 0.56888018, 0.66225435, 0.75562852, 0.84900269]),
<a list of 10 Patch objects>)
Eric
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