On Fri, Feb 18, 2011 at 9:13 AM, JamesTan12 <lance...@hotmail.com> wrote:
>
> Hi I have a list (Key values) with values I would like to plot to a
> matplotlib histogram
>
> [('a', 155), ('c', 73), ('b', 19), ('e', 260), ('d', 73), ('g', 42), ('f',
> 47), ('i', 175), ('h', 77), ('k', 7), ('j', 2), ('m', 76), ('l', 63), ('o',
> 174), ('n', 145), ('q', 3), ('p', 61), ('s', 153), ('r', 143), ('u', 50),
> ('t', 193), ('w', 19), ('v', 21), ('y', 55), ('x', 4), ('z', 4)]
>
> Can anyone suggest how do I go about to plot it into a histogram with
> x-asix
> being the key and y axis being the value.?
>
I would do something like the following:
data = [('a', 155), ('c', 73), ('b', 19), ('e', 260), ('d', 73), ('g', 42),
('f',
47), ('i', 175), ('h', 77), ('k', 7), ('j', 2), ('m', 76), ('l', 63), ('o',
174), ('n', 145), ('q', 3), ('p', 61), ('s', 153), ('r', 143), ('u', 50),
('t', 193), ('w', 19), ('v', 21), ('y', 55), ('x', 4), ('z', 4)]
x, y = zip(*data)
xlocs = np.arange(len(x))
fig = plt.figure()
ax = fig.gca()
ax.bar(xlocs + 0.6, y)
ax.set_xticks(xlocs + 1)
ax.set_xticklabels(x)
ax.set_xlim(0.0, xlocs.max() + 2)
plt.show()
The xlocs + 0.6 is to list the left edge of the bars so that they are
centered on integer tick locations (the bars are 0.8 wide by default). The
xlocs + 1 is to set the xaxis ticks at the center of each bar, and the
xlocs.max() + 2 is to have enough room on the right hand side of your graph
for everything.
I hope that helps!
Ben Root
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