Thanks, I think cbar.ax.invert_yaxis() is what I am looking for.
Chao
On Sat, Nov 10, 2012 at 4:51 PM, Damon McDougall
<damon.mcdoug...@gmail.com>wrote:
> On Sat, Nov 10, 2012 at 9:41 AM, Paul Hobson <pmhob...@gmail.com> wrote:
> > On Sat, Nov 10, 2012 at 7:07 AM, Chao YUE <chaoyue...@gmail.com> wrote:
> >>
> >> Dear all,
> >>
> >> Is there a way to reverse the colorbar label, the default is small
> value at the bottom and big value at the top, yet I would like the big
> value at the bottom and small value at the top.
> >>
> >> all code in pylab mode.
> >>
> >> import numpy as np
> >> import matplotlib as mat
> >>
> >> a = np.arange(100).reshape(10,10)
> >> contourf(a,levels=np.arange(0,101,10))
> >> colorbar()
> >>
> >> in the above figure, colorbar label shows 0 at the bottom and 100 at
> the top.
> >> Yet I want the 0 at the top and the 100 at the bottom, with the same
> sequence of colors in the colorbar.
> >>
> >> One way is to reverse the cmap, and then reverse the colorbar labels at
> the same time:
> >> a = np.arange(100).reshape(10,10)
> >> contourf(a,levels=np.arange(0,101,10),cmap=mat.cm.jet_r)
> >> cbar = colorbar()
> >> cbar.set_ticks(np.arange(0,101,10))
> >> cbar.set_ticklabels(np.arange(100,-1,-10))
> >
> > Chao,
> >
> > I think it's as simple as:
> >
> > import numpy as np
> > import matplotlib.pyplot as plt
> >
> > a = np.arange(100).reshape(10,10)
> > fig, ax1 = plt.subplots()
> > CS = ax1.contourf(a,levels=np.arange(0,101,10))
> > cbar = plt.colorbar(CS)
> > cbar.ax.invert_yaxis()
> >
> > Does that produce the desired results?
> > -p
>
> Or, you could plot -a instead of a.
>
> --
> Damon McDougall
> http://www.damon-is-a-geek.com
> Institute for Computational Engineering Sciences
> 201 E. 24th St.
> Stop C0200
> The University of Texas at Austin
> Austin, TX 78712-1229
>
--
***********************************************************************************
Chao YUE
Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL)
UMR 1572 CEA-CNRS-UVSQ
Batiment 712 - Pe 119
91191 GIF Sur YVETTE Cedex
Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16
************************************************************************************
------------------------------------------------------------------------------
Everyone hates slow websites. So do we.
Make your web apps faster with AppDynamics
Download AppDynamics Lite for free today:
http://p.sf.net/sfu/appdyn_d2d_nov
_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users
