R：来自ggplot2的qplot中的错误：参数“env”缺少，没有默认值 [英] R: error in qplot from ggplot2: argument "env" is missing, with no default

问题描述

我使用ggplot2的qplot来绘制R中不同物种分散种子的距离。当我使用 geom ='density'时，它工作得很好！但是我真正想要的是一个频率/面积图，对此我得到一个我不知道如何解决的错误。

I am using qplot from ggplot2 to plot the distances of seeds dispersed by different species in R. When I use geom='density', it works just fine! But what I really want is a frequency/area plot, for which I get an error I do not know how to address.

这是有效的：

qplot(Dist,data=testx,geom="density",fill=Animal,log=c('x','y'),alpha=I(0.5))

这是行不通的：

qplot(Dist,data=testx,geom="area",fill=Animal,log=c('x','y'))

Error in exists(name, envir = env, mode = mode) : 
  argument "env" is missing, with no default

帮助？感谢！

推荐答案

关于此错误消息，可能有助于指出这是您使用空为直方图设置的数据：

Regarding this error message it might help to point out that this is the error message you get when you use an empty data set for a histogram:

df <- data.frame(testx = rnorm(0))
p <- ggplot(df, aes(x=testx)) +
  geom_histogram()
plot(p)

Error in exists(name, envir = env, mode = mode) : 
  argument "env" is missing, with no default

不幸的是，错误信息在这种情况下根本没有什么帮助。当我第一次遇到这个问题时，花了一些时间才发现我只是意外地结束了一个空的数据框。 OP可能有一个不同的问题，但总是很高兴知道这个错误与这个愚蠢的错误有关。

Unfortunately, the error message is not very helpful at all in this case. When I first ran into this problem it took me some time to figure out that I just accidentally had ended up with an empty data frame. The OP probably had a different problem, but it is always good to know that this error is connected to this stupid mistake.

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