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 > <meest...@aesku-kipp.com> 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 > > ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
