Try

    cb.orientation = "horizontal"
    cb.update_bruteforce(cb.mappable)

it seems to work okay.
However, note that "update_bruteforce" clears the axes then redraws.
So, if you added some artists in the colorbar axes by yourself
(although this is not likely), they will be lost.

Regards,

-JJ



On Thu, Mar 4, 2010 at 8:48 PM, Thomas Robitaille
<thomas.robitai...@gmail.com> wrote:
> Hi,
>
> I would like to change the orientation of a colorbar once it has already been 
> drawn. So for example if I create the colorbar with:
>
> cb = fig.colorbar(mappable=image, cax=cax, orientation='vertical')
>
> I would like to be able to do
>
> cb.set_orientation('horizontal')
>
> Is there a way to do this, since set_orientation does not exist?
>
> Thanks for any help,
>
> Thomas
>
>
>
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