从gridExtras的grid.arrange退出，“仅在'gList'中允许'grobs'"更新后

问题描述：

我刚刚在Mac上更新了R，R Studio和一堆软件包，包括ggplot2和gridExtras.现在gridExtras无法进行基本绘图，并显示以下错误:

I just updated R, R Studio, and a bunch of packages including ggplot2 and gridExtras on my Mac. Now gridExtras is failing in basic plotting with the error:

"gList"中仅允许使用"grobs""

"only 'grobs' allowed in "gList""

下面的一些代码应该可以工作，但是不起作用:

Here's some code that should work but does not:

library(ggplot2)
p1 = qplot(1:10,rnorm(10))
p2 = qplot(1:10,rnorm(10))
library(gridExtra)
grid.arrange(p1, p2, ncol=2, main = "Main title")

这将转储以下错误:

Error in gList(list(grobs = list(list(x = 0.5, y = 0.5, width = 1, height = 1,  : 
  only 'grobs' allowed in "gList"
In addition: Warning message:
In grob$wrapvp <- vp : Coercing LHS to a list

感谢您的帮助！

答

这是因为grid.arrange不再具有main参数(似乎在2015年夏季的2.0.0版本中已被淘汰)，因此认为main=参数必须是grob.要替换main，您现在可以使用top参数(以及bottom，left和right).

It is because grid.arrange does not have a main parameter anymore (seems to have been eliminated around Summer 2015 with the 2.0.0 release) and thus thinks that the main= parameter must be a grob. To replace the main, you can use the top parameter now (as well as a bottom, left, and right).

因此，例如:

library(ggplot2)
p1 = qplot(1:10,rnorm(10))
p2 = qplot(1:10,rnorm(10))

library(gridExtra)
grid.arrange(p1, p2, ncol=2,top="Main Title")

该消息有点令人困惑，这是因为它查看了它不知道的所有参数，并假定它们可能是它可以绘制的grobs(图形对象).像这样令人困惑的错误消息是您为此灵活性付出的代价.

The message is a bit confusing, that is because it looks at all the parameters it does not know and assumes they might be grobs (graphical objects) that it can plot. A confusing error message like this is the price you pay for that flexibility.

注意:-如果您有很多grobs，则应考虑将它们全部打包到列表中并使用以下格式:

Note: - if you have a lot of grobs you should consider packing them all into a list and use the form:

grid.arrange( grobs = list(p1,p2,...),...

这是上面的代码导致的结果:

Here is what that above code results in:

从gridExtras的grid.arrange退出，“仅在'gList'中允许'grobs'"更新后

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