Re: [Matplotlib-users] 2 x-axes

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

Neal Becker wrote:

> I have a semilog plot.  I'd like to add a second x axis (maybe below the
> existing one, or else maybe on top of graph).  This second x axis is simply
> describing the same existing data, in different units.
> 
> For example imagine a plot of
> 
> x - time in seconds
> y - velocity
> 
> x2 - time in minutes
> 
> 

This almost works:
    fig = plt.figure() 
    ax = fig.add_subplot(111) 
...
    ax2 = ax.twiny()
    min_x, max_x = ax.get_xlim()
    ax2.set_xlim (min_x-1, max_x-1)

except the 2nd x axis is on the top, and prints right on top of the title