Re: [Matplotlib-users] Line up data points and xticklabels

[Alan G I. <ai...@am...>]

On Thu, 21 Jul 2005, Rick Kwan apparently wrote: 
> I'm trying to produce a 2D plot of data points where the 
> X-axis represents a sequence of named events.  A grid and 
> xticklabels have been enabled for clarity. 

> For a sample size of 11, all the points fall on the grid.  For 12, 
> they do not.  Beyond that seems to be on a case-by-case basis. 
> I'm sure I must be abusing the relationship between ticks and data, 
> but the proper solution eludes me. 

> from pylab import * 
> # top = 11      # 11 produces point on grid 
> top = 12        # 12 produces skewed data points 
> iter = [i for i in range(top)] 
> ax = subplot(111) 
> plot(iter, iter, 'gd-') 
> grid(True) 
> ax.xaxis.set_major_locator(LinearLocator(top)) 
> xlabs = ax.set_xticklabels(['evt%d'%i for i in range(top)]) 
> show() 




Count the gridlines.  ;-)
You are mislabeling the tics.
(You might set the axes ranges explicitly to address this.)

hth,
Alan Isaac