限制ggplot2轴而不移除数据(外部限制):缩放 [英] Limit ggplot2 axes without removing data (outside limits): zoom
问题描述
如果您在ggplot中指定了轴限制,则会移除离群点。这对点很好,但是你可能想绘制与指定范围相交的线,但ggplot的范围
或 xlim / ylim
方法删除这些。有没有另外一种方法来指定绘图轴范围而不删除离群数据?
eg
require(ggplot2)
d = data.frame(x = c(1,4,7,2,9,7),y = c(2,5,4,10,5,3 ),grp = c('a','a','b','b','c','c'))
ggplot(d,aes(x,y,group = grp)) + geom_line()
ggplot(d,aes(x,y,group = grp))+ geom_line()+ scale_y_continuous(limits = c(0,7))
ggplot(d,aes(x ,y,group = grp))+ geom_line()+ ylim(0,7)
哈德利在第99页解释了这一点;他的 ggplot2书(第1版)如果您有第二版,请参阅第160-161页
问题在于,如果您在比例尺内设置 limits
或设置 ylim
会导致数据被丢弃,因为它们正在限制数据。对于真实缩放(保留所有数据),您需要在笛卡尔坐标系内设置限制。欲了解更多信息,请参阅: http://docs.ggplot2.org/current/coord_cartesian.html
$ b $
ggplot(d,aes(x,y,group = grp))+ geom_line()+
coord_cartesian ylim = c(0,7))
If you specify axis limits in ggplot the outlying points are removed. This is fine for points, but you might want to plot lines that intersect with the specified range, but ggplot's range
or xlim/ylim
methods removes these. Is there another way to specify the plot axis range without removing outlying data?
e.g.
require(ggplot2)
d = data.frame(x=c(1,4,7,2,9,7), y=c(2,5,4,10,5,3), grp=c('a','a','b','b','c','c'))
ggplot(d, aes(x, y, group=grp)) + geom_line()
ggplot(d, aes(x, y, group=grp)) + geom_line() + scale_y_continuous(limits=c(0,7))
ggplot(d, aes(x, y, group=grp)) + geom_line() + ylim(0,7)
Hadley explains this on pp. 99; 133 of his ggplot2 book (1st edition), or pp. 160 - 161 if you have the second edition
The issue is that as you say limits
inside the scale or setting ylim
causes data to be thrown away, as they are constraining the data. For a true zoom (keep all the data), you need to set the limits inside of the Cartesian coordinate system. For more see: http://docs.ggplot2.org/current/coord_cartesian.html
ggplot(d, aes(x, y, group=grp)) + geom_line() +
coord_cartesian(ylim=c(0, 7))
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