Re: [Matplotlib-users] example of pareto chart

[Jeffrey M. <jm...@gm...>]

I think pareto charts are supposed to be percentages, not totals.

data = [83, 38, 7, 5, 5, 4, 4, 2, 1]
labels = ["Vertical", "Horizontal", "Upper", "Lower", "Left", "Right",
"Behind", "Front", "Down"]
colors = ["#001499", "#ff7f00", "#9440ed", "#edc240", "#238c3f",
"#a60085", "#00cca3", "#464f8c", "#005947", "#00004d",
        "#cc0052", "#591616", "#7d8060", "#299da6", "#9c8fbf",
"#4c132a", "#8c3f23", "#85cc33", "#607980", "#7c30bf", "#bf9360",
        "#324d13", "#13394d", "#4c1659", "#b25f00", "#99cca7",
"#669ccc", "#594358"]

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

for i, d  in enumerate(data):
    ax1.bar(i + .25, d, .5, zorder=0, alpha=0.5, label = labels[i],
color=colors[i % len(colors)])

percent  = [d*1.0/sum(data) * 100 for d in np.cumsum(data)]
ax2.plot(np.arange(len(data)) + 0.5, percent, linestyle='-',
color='k', linewidth=2, zorder=5)

ax1.set_xticks(np.arange(len(data)) + 0.5)
ax1.set_xticklabels(labels, rotation=30, ha='right')
#ax1.legend()

ax1.set_ylabel('Defects')
ax2.set_ylabel('Percentage')
ax2.set_ylim(0,110)

plt.show()


On Mon, Sep 24, 2012 at 11:43 PM, Paul Hobson <pmh...@gm...> wrote:
>> 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()
>
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