与ggplot2的多面的饼图 [英] faceted piechart with ggplot2

问题描述

  qplot（x = factor（1），data = mtcars，fill = factor（cyl））+ 
 geom_bar（width = 1）+ 
 coord_polar（theta =y）+ 
 facet_grid（〜gear）
  

但所有的饼图共享y轴比例，其中一些不包括整个圆。我尝试过使用 facet_grid（〜gear，scales =free）但它不起作用。

我如何得到所有饼图的完整圈子？

解决方案

我想你只想 position ='fill'：

  ggplot （mtcars，aes（x = factor（1），fill = factor（cyl）））+ 
 facet_wrap（〜gear）+ 
 geom_bar（width = 1，position =fill）+ 
 coord_polar（theta =y）
  

为了将来的参考，从 geom_bar ：

默认情况下，在同一个地方出现的多个x将被堆叠
通过position_stack彼此重叠。如果您希望他们从
左右避开，请参阅position_dodge。最后，position_fill通过叠加条形图，然后伸展
或挤压到相同的高度，在每个x处显示
的相对比例。

I've done a faceted piechart with ggplot2 like this:

qplot(x=factor(1), data=mtcars, fill=factor(cyl)) + 
    geom_bar(width=1) +  
    coord_polar(theta="y") + 
    facet_grid(~gear)

but as all the piecharts share the y axis scale, some of them doesn't cover the full circle. I've tried with facet_grid(~gear, scales="free") but it doesn't work.

How could I get full circles for all the piecharts?

解决方案

I think you just want position = 'fill':

ggplot(mtcars,aes(x = factor(1),fill=factor(cyl))) + 
    facet_wrap(~gear) + 
    geom_bar(width = 1,position = "fill") + 
    coord_polar(theta="y")

For future reference, from the Details section of geom_bar:

By default, multiple x's occuring in the same place will be stacked a top one another by position_stack. If you want them to be dodged from side-to-side, see position_dodge. Finally, position_fill shows relative propotions at each x by stacking the bars and then stretching or squashing to the same height.

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