[SciPy-User] matplotlib: ticks at 0 and 2pi

Nikolaus Rath Nikolaus@rath....
Mon Apr 19 16:10:21 CDT 2010


Hello,

I'm trying to plot something from 0 to 2pi:

    fig = plt.figure()
    ax = fig.add_subplot(111)
    ax.set_title('Radial Magnetic Field')
    ax.set_ylabel(r'Poloidal Angle $\theta$')
    ax.set_xlabel(r'Toroidal Angle $\phi$')

    ax.set_xticks([0, 2 * math.pi])
    ax.set_xticklabels(['0', r'$2\pi$'])
    ax.set_yticklabels([r'$-\pi$', r'$\pi$'])
    ax.set_yticks([-math.pi, math.pi])

    ax.set_xlim(xmin=0, xmax=2 * math.pi)
    ax.set_ylim(ymin= -math.pi, ymax=math.pi)

But unfortunately the ticks for x=2pi and y=pi are not shown. They do
show up if I move them a tiny bit:

    ax.set_xticks([0, 2 * math.pi * 0.98])
    ax.set_yticks([-math.pi, math.pi * 0.98])
    
But obviously this is ugly.

Is there a way to show the labels without moving the to the wrong
position and without extending the axis limits (since that introduces a
white border)?

Best,
    
   -Nikolaus

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