Re: [Matplotlib-users] example of pareto chart

[Paul H. <pmh...@gm...>]

> On Mon, Sep 24, 2012 at 12:21 AM, Paul Tremblay <pau...@gm...>
> wrote:
>>
>> Here is my example of a Pareto chart.
>>
>> For an explanation of a Pareto chart:
>>
>> http://en.wikipedia.org/wiki/Pareto_chart
>>
>> Could I get this chart added to the matplolib gallery?
>>
>>
>> Thanks
>>
>> Paul
>>

> On 9/24/12 4:40 PM, Benjamin Root wrote:
> Your code looks overly complicated.  You shouldn't have to be doing the
> connection to the ylim_changed event, I don't think.  I think your main
> problem is that you are calling ax1.plot instead of ax2.plot.
>
> I am not against adding more examples to the gallery, but this would have to
> be cleaned up before it gets included.
>
> Ben Root

On Mon, Sep 24, 2012 at 5:50 PM, Paul Tremblay <pau...@gm...> wrote:
> I took my example from the matplotlib pages itself:
>
> http://matplotlib.org/examples/api/fahrenheit_celcius_scales.html
>
> If you know a better way, please show me.
>
> P.

Paul,

That example is an overly complicated template for making a pareto chart.

Here's how I'd do it:

# data
defects = [0, 32, 22, 15, 5, 2]
labels = ['', 'vertical', 'horizontal', 'behind', 'left area', 'other']

# axes
fig, ax1 = plt.subplots()
ax2 = ax1.twinx()

# plotting
ax1.bar(np.arange(len(defects))-0.4, defects, zorder=0, alpha=0.5)
ax2.plot(np.cumsum(defects), linestyle='-', color='k', linewidth=2, zorder=5)

# formatting
ax1.set_xticks(np.arange(len(defects)))
ax1.set_xticklabels(labels)
ax1.set_ylabel('Defects')
ax2.set_ylabel('Percentage')
plt.show()