Re: [Matplotlib-users] Difficulty with colorbar

[David T. <dl...@ca...>]

I think I realised what I was doing wrong, I didn't have the imshow() 
call beforehand in my program:

But using the code:

    cax = fig.add_axes([0.85, 0.1, 0.075, 0.8])
    a=outer(arange(0,1,0.01),ones(10))
    imshow(a,aspect='auto',cmap=cm.gray,origin='lower')

I get a set of axes from 0 to 10 in the x direction and 0 to 100 in 
y.How do I get rid of the x axis and scale the y axis from 0 to 1.

David

David Trethewey wrote:
> I've been trying to add a colorbar to my figure and have used the 
> following code;
>
> cax = axes([0.85, 0.1, 0.075, 0.8])
> colorbar(cax=cax)
>
> as a template (from 
> http://matplotlib.sourceforge.net/examples/pylab_examples/subplots_adjust.html)
>
> However I get an error:
>
> Traceback (most recent call last):
>   File "cornwall2.py", line 640, in <module>
>     
> draw_parishes(n_parishes,m_parishes,preoccratio_parishes,0,nthroot,scaling)
>   File "cornwall2.py", line 112, in draw_parishes
>     colorbar(cax=cax)
>   File 
> "c:\python25\lib\site-packages\matplotlib-0.98.3.0001-py2.5-win32.egg\matplotlib\pyplot.py", 
> line 1295, in colorbar
>     ret = gcf().colorbar(mappable, cax = cax, ax=ax, **kw)
>   File 
> "c:\python25\lib\site-packages\matplotlib-0.98.3.0001-py2.5-win32.egg\matplotlib\figure.py", 
> line 977, in colorbar
>     cb = cbar.Colorbar(cax, mappable, **kw)
>   File 
> "c:\python25\lib\site-packages\matplotlib-0.98.3.0001-py2.5-win32.egg\matplotlib\colorbar.py", 
> line 595, in __init__
>     mappable.autoscale_None() # Ensure mappable.norm.vmin, vmax
> AttributeError: 'NoneType' object has no attribute 'autoscale_None'
>
>
> How am I using colorbar incorrectly?
>
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