用半空间作为针织品的大标记

Question

我想要一个像50000这样的数字被打印在针织品文档中，用半个空间作为一个数千个分隔符。在LaTeX中，我只需要使用50\,000，我希望通过Sexpr命令将其打印出来。也就是说，我想要一个函数reformat，当它在以下方面使用时

\documentclass{standalone}

\begin{document}
<<>>=
num <- 50000
@

The number is \Sexpr{reformat(num)}.

\end{document}

用一半的空间打印5万张。我面临的问题是，使用formatC似乎不允许正确数量的反斜杠

formatC(num, format = "f", big.mark = "\,")
Error: '\,' is an unrecognized escape in character string starting ""\,"

formatC(num, format = "f", big.mark = "\\,")
[1] "50,000.0000"

formatC(num, format = "f", big.mark = "\\\,")
Error: '\,' is an unrecognized escape in character string starting ""\\\,"

reformat的正确功能是什么？

Answer 1

罗兰和巴普蒂斯特的解决方案都很好：

reformat <- function(num) formatC(num, format = "f", big.mark = "\\\\,")
reformat <- function(num) formatC(num, format = "f", big.mark = "\u2009")