Re: [Matplotlib-users] example of pareto chart

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

ax1.set_ylim(0, sum(data))
ax2.set_ylim(0, 100)
seems to solve both of these issues.

On Tue, Sep 25, 2012 at 11:16 AM, Paul Tremblay <pau...@gm...> wrote:
> There are two problems with this chart:
>
> 1. The scale is wrong. Imagine that you can stack all the bars on top of
> each other. When stacked, all the bars should fill in the graph exactly. In
> other words: ax1.set_ylim = sum(defects). See my original, or the wiki page.
>
> 2. The line starts in the middle of the bar. It needs to start on top, in
> the middle.
>
> Maybe there is  a way to correct 1 & 2 with your method, but I can't seem to
> find it.
>
> Thanks!
>
> Paul
>
>
> On Tue, Sep 25, 2012 at 12:58 PM, Jeffrey Melloy <jm...@gm...> wrote:
>>
>> 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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