编译PDF时自定义错误信息 [英] Customize error message when compiling PDF

问题描述

鉴于以下R编织文件：

\documentclass{article}
\begin{document}

<<data>>=
opts_chunk$set(comment = NA)  # omits "##" at beginning of error message
x <- data.frame(x1 = 1:10)
y <- data.frame()
@ 

<<output_x>>=
if (nrow(x) == 0) stop("x is an empty data frame.") else summary(x)
@

<<output_y>>=
if (nrow(y) == 0) stop("y is an empty data frame.") else summary(y)
@

\end{document}

正如预期的那样，最后一个块返回自定义消息的错误。编译的PDF看起来有点不同：

As expected, the last chunk returns an error with the custom message. The compiled PDF looks a little different:

Error: y is an empty data frame.

我希望这个文本只是

y is an empty data frame.

没有错误：部分或红色颜色。我可以实现吗如何？

Without the Error: part or the red color. Can I achieve this? How?

编辑：通过以下解决方法，我可以在模拟数据中使用：

I was able to make it in the mock data through the following workaround:

<<output_y>>=
if (nrow(y) == 0) cat("y is an empty data frame.") else summary(y)
@

但是，这并不适用于我的真实数据，因为我需要在那个时候停止这个功能。

However, that doesn't work with my real data, because I need the function to be stopped at that point.

推荐答案

虽然我不明白为什么不应该调用错误错误，您可以自定义输出钩子错误以删除错误：
$ b

Although I do not understand why an error should not be called Error, you are free to customize the output hook error to remove Error: from the message:

library(knitr)
knit_hooks$set(error = function(x, options) {
  knitr:::escape_latex(sub('^Error: ', '', x))
})

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