marcusantonius wrote:
> Hello,
> I have the problem, that sometimes the first and last ticklabel of a
> colorbar is not drawn. E.g. if I create a colorbar through
> fig.colorbar(p3,orientation='horizontal',ticks=np.arange(0.0,8,2))
> I only get ticklabels at 2,4,6, but I would like it to have 0,2,4,6,8 and I
> don't know how to control this behaviour. If I do
> cb=fig.colorbar(p3,orientation='horizontal',ticks=np.arange(0.0,8,2))
> the colorbar vanishes and instead I have 4 ticks with the labels
> 0.8,1.6,2.4,3.2
> Thank you for your help,
> Markus


The problem here is not the specification of the ticks, it is the actual 
range of the colorbar, which is taken from the norm object used in the 
color mapping.  Try this (in ipython -pylab):

imshow(rand(10,10)*8, vmin=0, vmax=8)

Alternatively, you can use the set_clim() method on any Mappable such as 
an image, or the pyplot clim() function, to set the limits.

Note also that to get the sequence [0,2,4,6,8] you need arange(0,9,2), 
not arange(0,8,2).  Or you can use linspace(0,8,5) if you prefer.


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