On Wed, Aug 5, 2009 at 9:40 AM, per freem<perfr...@gmail.com> wrote:
> hi all,
>
> is there a way in matplotlib to plot lines with errorbars, e.g. using
> errorbar(...) but instead of lines just have shaded, partly transparent
> regions that represent the error bars? people often use this to show
> confidence intervals or error bars... an example is here:
>
> http://eva.nersc.no/vhost/arctic-roos.org/doc/observations/images/ssmi1_ice_ext.png
>
> where the black line has shaded grey bands around. i'd like to plot
> something like this but have the band be partly transparent.

I use fill_between for this -- draw the line with "plot" and the
shaded region with "fill_between".  You can specify the alpha on the
fill_between call:

  
http://matplotlib.sourceforge.net/examples/pylab_examples/fill_between_demo.html
  
http://matplotlib.sourceforge.net/api/axes_api.html#matplotlib.axes.Axes.fill_between

JDH

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