Re: [Matplotlib-users] semilogy

[Neal B. <ndb...@gm...>]

Paul Ivanov wrote:

> Neal Becker, on 2011-01-05 08:19,  wrote:
>> I want to plot semilogy with major and minor grid.  I tried:
>> 
>> plt.grid(which='both')
>> 
>> But 2 problems:
>> 
>> 1) For semilogy, most of my viewers will expect to see 10 minor
>> ticks/major tick.  I got 5.  How do I change it?
> 
> Hi Neal,
> 
> odd, it works here. (See attached image)
> 
> In [1]: plt.semilogy(((np.random.rand(50)*9+1)))
> 
> If your problem persists, can you provide a small example where
> this does not work?  You might check the minor locator -  make
> sure that it is base 10

Perhaps because my data covered a large range 10**-7 ... 10**0?  I'll try some 
experiments.  I had to force it with:

fig.get_axes()[0].set_yticks ([a*(10**b) for b in xrange (-7,0) for a in xrange 
(1,10) ], minor=True)

> In [2]: plt.gca().yaxis.minor.locator._base
> Out[2]: 10.0
> 
>> 2) I'd like the major ticks to be solid lines, and minor ticks
>> to be dashed.  I got all dashed.
> 
> In [3]: plt.grid(which='major', linestyle='solid')
> In [4]: plt.grid(which='minor', linestyle='dashed')
>