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Re: BarChart - Extendng the Y-axis and labeling the endpoints
*To*: mathgroup at smc.vnet.net
*Subject*: [mg97612] Re: BarChart - Extendng the Y-axis and labeling the endpoints
*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
*Date*: Tue, 17 Mar 2009 04:57:33 -0500 (EST)
*Organization*: Uni Leipzig
*References*: <gphds3$om3$1@smc.vnet.net>
*Reply-to*: kuska at informatik.uni-leipzig.de
Hi,
BarChart[{1, 2, -1.3, 2.4}, PlotRangePadding -> {None, 0.2}]
??
Regards
Jens
Donald DuBois wrote:
> Here is a BarChart (almost directly from the Mathematica Documentation):
>
> Needs["BarCharts`"]
>
> thisBarChart = BarChart[{1, 2, -1.3, 2.4}]
>
> I am trying to extend the labeling of the Y-axis so that the endpoints of the Y-axs extend a little beyond
> the extremes of the data in the Y direction (the extremes of the data
> being -1.3 and 2.4) and these endpoints are labeled with
> multiples of the chosen increment.
>
> I believe this makes the BarChart easier to read and is aesthetically more pleasing.
>
> For example, with the above
> evaluation of BarChart, the labeling of the Y-axis goes from 2.0 to -1.0 in increments of 0.5 as chosen by Mathematica but the Y-axis itself extends
> beyond these labels.
>
> I would like to extend the labeling in both directions (positive and negative sides
> along the Y-axis) to the nearest integral multiple of
> the increment that Mathematica has chosen so the Y-axis
> would be extended slightly beyond the extremes of the data and the endpoints of the Y-axis would have labels.
>
> In this example, the Y-axis would be extended from 2.5 to -1.5 and the labeling would go from
>
> { -1.0, -0.5, 0.0, 0.5, 1.0, 1.5, 2.0} to
>
> {-1.5, -1.0, -0.5, 0.0, 0.5, 1.0, 1.5, 2.0, 2.5}
>
> with the labeling being integral multiples of the chosen increment.
>
> To do this, I need to know that the automatic labeling is in increments of 0.5 (as chosen by Mathematica) and then I need to extend the endpoint labels from {-1.0, 2.0} to {-1.5, 2.5}.
>
> I can get the PlotRange that is chosen by Mathematica automatically by using AbsoluteOptions on the graphical object called thisBarChart:
>
> AbsoluteOptions[thisBarChart, PlotRange]
>
> which produces
>
> {PlotRange -> {{0.4, 4.6}, {-1.3, 2.4}}}
>
> But, I still don't know the increment that Mathematica used so that I can force the labeling to a high of 2.5 and a minimum of -1.5.
>
> There's another complication:
>
> Assuming I did know (by magic) that the chosen increment was 0.5 for the labeling I thought I could then use
>
> BarChart[{1, 2, -1.3, 2.4}, PlotRange -> {Automatic, { 2.5, -1.5}}]
>
> to extend the Y-axis endpoints with labels of -1.5, and 2.5 but this doesn't work because the endpoints of the Y-azis are not labeled.
>
> I find, through experimentation only, that what I need is:
>
> BarChart[{1, 2, -1.3, 2.4}, PlotRange -> {Automatic, {3.0, -2.0}}]
>
> and the increment for the labeling has automatically changed to 1 (the fact that the increment has changed from 0.5 to 1.0 in this case is not a problem.)
>
> How can I get Mathematica to do this in a programmatic way so that I don't need to experiment each time to (1) get the Y-axis extended a little
> beyond the extremes of the data and (2) the endpoints
> labeled with integral multiples of the chosen increment?
>
> Thank you in advance for any help you can give me.
>
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