仅通过一点抑制来自geom_line的消息 [英] Suppress message from geom_line with only one point

问题描述

我正在遍历多个数据集以为每个数据集绘制线图.当我使用geom_line超过一分时，如何防止ggplot抱怨?

I'm iterating through multiple data sets to produce line plots for each set. How can I prevent ggplot from complaining when I use geom_line over one point?

例如，获取以下数据:

mydata = data.frame(
  x = c(1, 2),
  y = c(2, 2),
  group = as.factor(c("foo", "foo"))
)

创建折线图的外观和效果很好，因为折线中有两个点:

Creating line graph looks and works just fine because there are two points in the line:

ggplot(mydata, aes(x = x, y = y)) + 
  geom_point() + 
  geom_line(aes(group = group))

但是，仅绘制第一行会显示以下信息:

However, plotting only the fist row give the message:

geom_path:每个组仅包含一个观察值.您需要调整小组的审美吗?

geom_path: Each group consists of only one observation. Do you need to adjust the group aesthetic?

ggplot(mydata[1,], aes(x = x, y = y)) + 
      geom_point() + 
      geom_line(aes(group = group))

我的一些数字只有一点，并且消息会在产生这些数字的更大的脚本中导致挂断.我知道这些情节仍然有效，所以我担心的是避免出现此消息.如果可能的话，我还要避免使用suppressWarnings()，以免出现其他合法且意外的问题.

Some of my figures will only have one point and the messages cause hangups in the greater script that produces these figures. I know the plots still work, so my concern is avoiding the message. I'd also like to avoid using suppressWarnings() if possible in case another legitimate and unexpected issue arises.

推荐答案

对

Per an answer to this question: suppressMessages(ggplot()) fails because you have to wrap it around a print() call of the ggplot object--not the ggplot object itself. This is because the warning/message only occurs when the object is drawn.

因此，要在不显示警告消息的情况下查看图表，请执行以下操作:

So, to view your plot without a warning message run:

p <- ggplot(mydata[1,], aes(x = x, y = y)) + 
  geom_point() + 
  geom_line(aes(group = group))

suppressMessages(print(p))

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