Thanks, Ben. This is indeed what I was looking for and gives the desired
behavior.
Thanks a lot!
Chris
On Wed, 2012-05-23 at 08:55 -0400, Benjamin Root wrote:
>
> On Wed, May 23, 2012 at 4:03 AM, Meesters, Aesku.Kipp Institute
> <mee...@ae...> wrote:
> Hi,
>
> I'm following the example in the gallery to do a barchart plot
> (see
> http://matplotlib.sourceforge.net/examples/api/barchart_demo.html ).
>
> In contrast to the example I would like to see the error bars
> only above
> the bars, so I tried
>
> rects2 = ax.bar(ind+width, womenMeans, width, color='y',
> yerr=stds, error_kw = {'barsabove': True,
> 'ecolor' : 'k'}
>
> While the 'ecolor' argument gets accepted, 'barsabove'
> apparently has no
> effect (error bars still point up and downwards) - yet, no
> warning /
> error is triggered. Where is my mistake? Or is this a bug
> (still using
> version 1.0.1) with a known work-around?
>
> TIA
> Chris
>
>
> Chris,
>
> I don't think "barsabove" does what you want. By "above", it means
> that the errorbar is plotted in a layer on top of the plotting symbol
> rather than in the layer under it. Both ends will be plotted.
>
> To get what you want, you might want to try (Note: untested):
>
> rects2 = ax.bar(ind+width, womenMeans, width, color='y',
> yerr=np.vstack([[0]*len(stds), stds]), error_kw =
> {'ecolor' : 'k'})
>
> When yerr is a 2xN numpy array, errorbars are plotted at y-yerr[0, :]
> and y+yerr[1,:]. So, np.vstack creates a 2xN array where the first row
> is all zeros and the second row is the stds values.
>
> I hope that works for you!
> Ben Root
>
>
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