Question

I m making plots in Python and matplotlib, which I found huge and flexible, till now.

The only thing I couldn t find how to do, is to make my plot have multiple grids. I ve looked into the documentation, but that s just for line style...

I m thinking on something like two plots each one with a different grid, which will overlap them.

So, for example I want to make this graph:

Alt text http://img137.imageshack.us/img137/2017/waittimeprobability.png

Have a similar grid marks as this one:

Alt text http://img137.imageshack.us/img137/6122/saucelabssauceloadday.png

And by that, I mean, more frequent grids with lighter color between important points.

Answer 1

How about something like this (adapted from here):

from pylab import *
from matplotlib.ticker import MultipleLocator, FormatStrFormatter

t = arange(0.0, 100.0, 0.1)
s = sin(0.1*pi*t)*exp(-t*0.01)

ax = subplot(111)
plot(t,s)

ax.xaxis.set_major_locator(MultipleLocator(20))
ax.xaxis.set_major_formatter(FormatStrFormatter( %d ))
ax.xaxis.set_minor_locator(MultipleLocator(5))

ax.yaxis.set_major_locator(MultipleLocator(0.5))
ax.yaxis.set_minor_locator(MultipleLocator(0.1))

ax.xaxis.grid(True, minor )
ax.yaxis.grid(True, minor )
ax.xaxis.grid(True, major ,linewidth=2)
ax.yaxis.grid(True, major ,linewidth=2)

show()

enter image description here

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