I wrote the following code to do this for me...it is not entirely general
(in the sense that it doesn't accept all kwargs beyond bins and hatch) and
also allows me to do my own normalization.... But you should be able to
use it pretty easily.
def open_hist(arr,bins=10,norm=None,hatch=None):
import matplotlib as mpl
import pylab
# Get all of the scaling right by allowing pylab to do it.
d = pylab.hist(arr,bins)
ax = pylab.gca()
for i in d[2]:
ax.patches.remove(i)
width = d[1][1]-d[1][0]
if norm is None:
norm = 1.
else:
norm = float(norm)
# Determine the vertices of the no-line histogram.
verts = []
for i in range(len(d[0])):
if i==0:
x = d[1][i]
y = 0.
verts.append((x,y))
if i==len(d[0])-1:
x = d[1][i]
y = d[0][i]/norm
verts.append((x,y))
x = d[1][i]+width
verts.append((x,y))
y = 0.
verts.append((x,y))
else:
x = d[1][i]
y = d[0][i]/norm
verts.append((x,y))
x = d[1][i]+width
verts.append((x,y))
# Let pylab do its thing....
p = pylab.Polygon(verts,transform=ax.transData,hatch=hatch)
p.set_fill(0)
ax.add_patch(p)
On Mon, 24 Sep 2007, Tommy Grav wrote:
> I need to generate a set of histograms, but would like to plot only
> the "skyline"
> of the histogram, and leave out the vertical lines where adjencent
> bars touch.
> I have looked at the docs, but nothing jumped out at me as the right
> keyword
> for this. Is this possible? and if so, how?
>
> Cheers
> Tommy
>
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