ggplot2在直方图最大值中查找计数的数量 [英] ggplot2 find number of counts in histogram maximum
问题描述
我有一个简短的R脚本,它使用ggplot2绘制了一些直方图。如何根据直方图中的最大频率(加上10%)自动设置直方图中的ymax限制,即
I have a short R script which plots a few histograms using ggplot2. How can I automatically set the ymax limit in the histogram based on the maximum frequency in the histogram (plus 10%) i.e
scale_y_continuous(limits= c(0,ymax*1.1)
plot = ggplot(data, aes(myo_activity)) +
geom_histogram(binwidth=0.5, aes(fill=..count..))
plot + scale_x_continuous(expand = c(0,0), limits = c(30,90)) +
scale_y_continuous(expand = c(0,0), limits = c(0,140))
推荐答案
电影作为示例数据不提供。
For example used data movies
as sample data are not provided.
使用函数 ggplot_build()
,您可以获取包含用于绘制数据的所有元素的列表,所有数据都在列表元素 data [[1]]
中。这个元素的c $ c>包含了直方图的值,你可以用这个列的最大值来为你的绘图设置限制。
With function ggplot_build()
you can get list containing all the elements used for plotting your data. All the data are in list element data[[1]]
. Column count
of this element contains values for histogram. You can use maximal value of this column to set limits for your plot.
plot = ggplot(movies, aes(rating)) + geom_histogram(binwidth=0.5, aes(fill=..count..))
ggplot_build(plot)$data[[1]]
fill y count x ndensity ncount density PANEL group ymin ymax xmin xmax
1 #132B43 0 0 0.75 0.0000000000 0.0000000000 0.0000000000 1 1 0 0 0.5 1.0
2 #142E48 272 272 1.25 0.0323232323 0.0323232323 0.0092535892 1 1 0 272 1.0 1.5
3 #16314B 454 454 1.75 0.0539512775 0.0539512775 0.0154453290 1 1 0 454 1.5 2.0
4 #17344F 668 668 2.25 0.0793820559 0.0793820559 0.0227257263 1 1 0 668 2.0 2.5
5 #1B3A58 1133 1133 2.75 0.1346405229 0.1346405229 0.0385452813 1 1 0 1133 2.5 3.0
plot + scale_y_continuous(expand = c(0,0),
limits=c(0,max(ggplot_build(plot)$data[[1]]$count)*1.1))
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