plot a histogram of relative percentage of data

Community matplotlib-users
1

Hi all,

In my latest post, I wanted to use the mpl.hist() function in a different way, i.e.:

x = datalist
bins= 100
hist(x,bins,normed=0) #returns a tupple (n,bins,patches)

Instead of ploting the number of counts n, I wanted to plot the relative percentage of counts, i.e. n/len(x). I can’t really use the option normed=1 which returns n/(len(x)*dbin). In the axes.py module, this would simply mean adding an argument e.g. relpercent = 1. I added the code line to show how this could be done (in major cap). If this is useful, how could it be modified in the distribution ?

def hist(self, x, bins=10, RELPERCENT = 1, normed=0, bottom=None,
          align='edge',

orientation=‘vertical’, width=None,
log=False, **kwargs):
“”"

    if not self._hold: self.cla()
    n, bins = npy.histogram(x, bins, range=None, normed=normed)
    IF NOT NORMED AND RELPERCENT: N = N/FLOAT(LEN(X))
    if width is None: width = 0.9*(bins[1]-bins[0])
    if orientation == 'horizontal':
        patches = self.barh(bins, n, height=width, left=bottom,
                             align=align,

log=log)
elif orientation == ‘vertical’:
patches = self.bar(bins, n, width=width, bottom=bottom,
align=align, log=log)
else:
raise ValueError, ‘invalid orientation: %s’ % orientation
for p in patches:
p.update(kwargs)
return n, bins, cbook.silent_list(‘Patch’, patches)

···

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2

Hi!

You could also use the bar method and do the histogram with numpy:

import numpy as n
import pylab as p

foo = n.random.normal(size=100)
p.hist(foo, 20)
p.twinx()
counts, bins = n.histogram(foo, 20)
counts = counts.astype(float)/len(foo)
width = (bins[1]-bins[0]) * .9
p.bar(bins ,counts, width=width, fc=‘r’)

Cheers! Bernhard

···

On Fri, Feb 22, 2008 at 4:08 PM, Auré Gourrier <aurelien.gourrier@…136…> wrote:

Hi all,

In my latest post, I wanted to use the mpl.hist() function in a different way, i.e.:

x = datalist
bins= 100
hist(x,bins,normed=0) #returns a tupple (n,bins,patches)

Instead of ploting the number of counts n, I wanted to plot the relative percentage of counts, i.e. n/len(x). I can’t really use the option normed=1 which returns n/(len(x)*dbin). In the axes.py module, this would simply mean adding an argument e.g. relpercent = 1. I added the code line to show how this could be done (in major cap). If this is useful, how could it be modified in the distribution ?

def hist(self, x, bins=10, RELPERCENT = 1, normed=0, bottom=None,
          align='edge',

orientation=‘vertical’, width=None,
log=False, **kwargs):
“”"

    if not self._hold: self.cla()
    n, bins = npy.histogram(x, bins, range=None, normed=normed)

    IF NOT NORMED AND RELPERCENT: N = N/FLOAT(LEN(X))
    if width is None: width = 0.9*(bins[1]-bins[0])
    if orientation == 'horizontal':
        patches = self.barh(bins, n, height=width, left=bottom,

                            align=align,

log=log)
elif orientation == ‘vertical’:
patches = self.bar(bins, n, width=width, bottom=bottom,
align=align, log=log)
else:
raise ValueError, ‘invalid orientation: %s’ % orientation

    for p in patches:
        p.update(kwargs)
    return n, bins, cbook.silent_list('Patch', patches)

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