删除ggplot2中的阴图区域 [英] Removing negative plot area in ggplot2

问题描述

如何删除ggplot2中x和y轴下方的绘图区域（请参阅下面的示例）。

How can I remove the plot area below the x and y axis in ggplot2 (see example below). I have tried several of the theme elements (panel.border, panel.margin, plot.margin) without any luck.

p <- ggplot(mtcars, aes(x = wt, y = mpg,xmin=0,ymin=0)) + geom_point()

使用展开参数进行连续比例美学...

Use the expand argument in continuous scale aesthetics...

p <- ggplot(mtcars, aes(x = wt, y = mpg,xmin=0,ymin=0)) +
geom_point()+
scale_x_continuous( expand = c(0,0) , limits = c(0,6) )+
scale_y_continuous( expand = c(0,0), limits = c(0,35) )

设置限制以避免极端值被切断。

Set limits to avoid extreme values being cut off.

但是如果你不想在整个图表中留下空白，你需要使用主题元素， plot.margin ，就像所以（注意在右下边的阴谋部分被切成零）。

but in case you wanted no margin around the entire plot, you need to use the theme element, plot.margin, like so (notice in the plot below the extreme right edge is cut to zero)..

require(grid) # for unit
p + theme( plot.margin = unit( c(0,0,0,0) , "in" ) )

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