Re: [Matplotlib-users] how to prevent colorbar from taking space from axes

[Benjamin R. <ben...@ou...>]

If you have matplotlib v1.3 (maybe 1.2, I can't remember), you can pass a
list of axes to the "ax" argument of colorbar, and it should steal space
equally from all the specified axes.

I am also particularly fond of using the mpl_toolkit axis_grid1, which
provides you a nice way to preallocate space for colorbars in different
ways:
http://matplotlib.org/mpl_toolkits/axes_grid/users/overview.html?highlight=axes_grid1#axes-grid1

I hope that helps!
Ben Root


On Thu, Dec 11, 2014 at 1:49 PM, Slavin, Jonathan <js...@cf...>
wrote:
>
> Hi,
>
> I'm trying to make a plot with four panes (2x2).  The two on top are
> images, created with pcolormesh, while the ones on the bottom are line
> plots.  I'd like to the axes to line up -- which they do -- but when I add
> a colorbar to the top right, it steals space from the image plot.  I only
> need one colorbar since the two images are forced to have the same
> scaling.  Can anyone tell me how to insert the colorbar on the top right
> without it taking space from the top right image -- or force the space to
> be taken from the horizontal space of all the plots so the shapes are
> uniform?  I've tried several approaches including using make_axes_locatable
> from mpl_toolkits.axes_grid1 with no success.  I must admit that I don't
> really understand what make_axes_locatable does, so it may be entirely the
> wrong thing to use.  On the other hand, not using it, i.e. just using
> plt.colorbar or fig.colorbar seems to do essentially the same thing, steal
> space from the axes.  The basics of the plot are like this:
>
> x = np.arange(20.)
> xc = (x[:-1] + x[1:])/2.
> y = np.arange(15.)
> xx,yy = np.meshgrid(x,y)
> z1 = np.random.randn(14,19)
> z2 = np.random.randn(14,19)
>
> fig,ax = plt.subplots(2,2)
> pc = ax[0,0].pcolormesh(x,y,z1)
> ax[1,0].plot(xc,z1[0,:])
> ax[0,1].pcolormesh(x,y,z2)
> ax[1,1].plot(xc,z2[0,:])
> cb = plt.colorbar(pc, ax=ax[0,1])
> plt.show()
>
> Any help would be appreciated.
>
> Regards,
> Jon
> --
> ________________________________________________________
> Jonathan D. Slavin                 Harvard-Smithsonian CfA
> js...@cf...       60 Garden Street, MS 83
> phone: (617) 496-7981       Cambridge, MA 02138-1516
> fax: (617) 496-7577            USA
> ________________________________________________________
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