To compare two histograms you can plot a bihistogram as suggested on
http://www.itl.nist.gov/div898/handbook/eda/section3/bihistog.htm
The little function I've written to do so is below. See if it helps.
Antonio
import scipy
from pylab import figure
def bihist(y1, y2, nbins=10, h=None):
'''
Bihistogram.
h is an axis handle. If not present, a new figure is created.
'''
if h is None: h = figure().add_subplot(111)
xmin = scipy.floor(scipy.minimum(y1.min(), y2.min()))
xmax = scipy.ceil(scipy.maximum(y1.max(), y2.max()))
bins = scipy.linspace(xmin, xmax, nbins)
n1, bins1, patch1 = h.hist(y1, bins)
n2, bins2, patch2 = h.hist(y2, bins)
# set ymax:
ymax = 0
for i in patch1:
height = i.get_height()
if height > ymax: ymax = height
# invert second histogram and set ymin:
ymin = 0
for i in patch2:
height = i.get_height()
height = -height
i.set_height(height)
if height < ymin: ymin = height
h.set_ylim(ymin*1.1, ymax*1.1)
h.figure.canvas.draw()
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