8

I'm trying to make a histogram of a simple list of numbers in python using ipython notebook and ggplot for python. Using pylab, it's easy enough, but I cannot get ggplot to work.

I'm using this code (based on the diamond histogram example, which does work for me):

from ggplot import *
a = [1, 1, 2, 1, 1, 4, 5, 6]
p = ggplot(aes(x='carat'), data=a)
p + geom_hist() + ggtitle("Histogram of Diamond Carats") + labs("Carats", "Freq")

Using ipython & pylab, I can make a histogram with just hist(a) and it displays. How do I make a histogram come up using ggplot?

Hooked
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Amandasaurus
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  • Do you want ggplot because of the style or is there another reason. If the former is the case, you can try mpltools, a matplotlib extension which can mimic the style of ggplot (see http://tonysyu.github.io/mpltools/auto_examples/style/plot_ggplot.html) – Jakob Oct 15 '13 at 20:21
  • I mostly want to use ggplot because it seems interesting. – Amandasaurus Oct 16 '13 at 10:54

2 Answers2

17

If you just want to make a histogram of the numbers in your vector 'a', there are a couple of problems.

First, ggplot accepts data in the form of a pandas Dataframe, so you need to build that first. 

import pandas as pd
a = [1, 1, 2, 1, 1, 4, 5, 6]
df = pd.DataFrame(a, columns=['a'])

Second, the geom is geom_histogram() not geom_hist(). And finally, it looks like you're throwing in code from one of the example plots of the diamond data. You don't need that, so I've removed it. 

from ggplot import *
p = ggplot(aes(x='a'), data=df)
p + geom_histogram(binwidth=1)

enter image description here

Aman
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8

Did you add

%matplotlib inline

as first command in your notebook?

begray
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