Rhtml：警告：'< var>'上的转换失败在'mbcsToSbcs'中：点代替< var> [英] Rhtml: Warning: conversion failure on '<var>' in 'mbcsToSbcs': dot substituted for <var>
问题描述
环境：
R v。2.15.1在Mac OS 10.8.2，平台x86_64-apple-darwin9.8.0 / x86_64 （64位），RStudio IDE设置为使用UTF-8作为其默认编码。操作系统还使用UTF-8。
> Sys.getlocale（category =LC_ALL）
[1]sk_SK.UTF-8 / sk_SK.UTF-8 / sk_SK.UTF-8 / C / sk_SK.UTF-8 / sk_SK.UTF-8
目标：
从R HTML（.Rhtml）文件生成一个HTML文件，其中包含一个扩展拉丁字符的图形，如š或č。
问题：
当我点击编织HTML 时，输出如下所示：
pre>
plot（1：2，main =šč）
##警告：'mbcsToSbcs'中'šč'的转换失败：点代替
##
##警告：'mbcsToSbcs'中'šč'上的转换失败：点替换
##
##警告：'mbcsToSbcs'中'šč'的转换失败：点代替
##
##警告：'mbcsToSbcs'中'šč'上的转换失败：点代替
##< 8d>
**尽管发出警告，但使用正确的字符。**
问题：
是什么原因导致问题及解决方法？我至少可以摆脱在结果文件中显示的警告？
无偏的注释：
我一直在寻找一两个解决方案，发现了很多类似的案例，并尝试了许多不同的潜在解决方案（许多与PDF输出相关的解决方案，如果我使用只是一样
2012年11月9日编辑
使用@metsoquoia建议的 Encoding（）的解决方案可以正常工作，但是考虑到需要打印代码，优选没有该功能，我更喜欢提供的解决方案由@nograpes使用函数 pdf.options（）。
尽管如此， p>
<！ - begin.rcode
pdf.options（encoding ='ISOLatin2.enc'）
plot（cars，main =Ťažký）
end.rcode - >
产生相同的警告，
<！ - begin.rcode
pdf.options（encoding ='ISOLatin2.enc'）
end.rcode - >
<！ - begin.rcode
plot（cars，main =Ťažký）
end.rcode - >
按预期工作。 为什么是这样的？我认为在R中运行命令时，年表是重要的。
所以，为了我的目的，确定的解决方案是put
<！ - begin.rcode echo =FALSE
pdf.options（encoding ='ISOLatin2 .enc'）
end.rcode - >每个代码开头的
@水杉的答案有效，但是我想补充一点。如果将PDF选项设置为不同的编码，则不需要将所有输出文本包含在 Encoding 中。在点击编织HTML 之前运行此操作：
pdf.options（encoding ='ISOLatin2.enc'）
Ripley谈论编码问题，特别是与在这里发布，这可能是感兴趣的。值得注意的是，这种错误在Windows上不会以相同的方式发生，因为编码以完全不同的方式处理。
其他语言可能需要使用其他编码文件，但这似乎适用于斯洛伐克语。
Environment:
R v. 2.15.1 on Mac OS 10.8.2, platform x86_64-apple-darwin9.8.0/x86_64 (64-bit), with RStudio IDE which is set to use UTF-8 as its default encoding. The OS also uses UTF-8.
> Sys.getlocale(category = "LC_ALL")
[1] "sk_SK.UTF-8/sk_SK.UTF-8/sk_SK.UTF-8/C/sk_SK.UTF-8/sk_SK.UTF-8"
Objective:
Generate an HTML file from the R HTML (.Rhtml) file, containing a plot with extended latin characters, such as š or č.
Problem:
When I click on Knit HTML, the output looks like this:
plot(1:2, main = "šč")
## Warning: conversion failure on 'šč' in 'mbcsToSbcs': dot substituted for
##
## Warning: conversion failure on 'šč' in 'mbcsToSbcs': dot substituted for
##
## Warning: conversion failure on 'šč' in 'mbcsToSbcs': dot substituted for
##
## Warning: conversion failure on 'šč' in 'mbcsToSbcs': dot substituted for
## <8d>
**Plot with correct characters despite the warnings.**
Question:
What causes the problem and how to solve it? How can I at least get rid of the warnings which do show in the resulting file?
Hopeless note:
I have been searching for a solution for the past hour or two, found many similar cases and tried many different potential solutions (many related to PDF output, which is cocked up the same way if I use just Sweave), and now I am literally hopeless.
Edit on 9 November 2012:
The solution using Encoding() suggested by @metasequoia does work, but considering the need to print the code as well, preferably without that function, I prefer the solution provided by @nograpes using the function pdf.options().
It is interesting, though, that while
<!--begin.rcode
pdf.options(encoding='ISOLatin2.enc')
plot(cars, main="Ťažký")
end.rcode-->
produces the same warnings,
<!--begin.rcode
pdf.options(encoding='ISOLatin2.enc')
end.rcode-->
<!--begin.rcode
plot(cars, main="Ťažký")
end.rcode-->
works as expected. Why is that? I thought that chronology is all that matters when running commands in R.
So, the definite solution for my purposes is to put
<!--begin.rcode echo="FALSE"
pdf.options(encoding='ISOLatin2.enc')
end.rcode-->
in the beginning of each of my codes.
The answer from @metasequoia works, but I wanted to add a few points. If you set the PDF options to a different encoding you won't need to wrap all your output text in Encoding. Run this before clicking Knit HTML:
pdf.options(encoding='ISOLatin2.enc')
Ripley talks about encoding issues, especially as the relate to PDFs, in a post here, and it may be of interest. Notably, this error will not occur in the same way on Windows, because encoding is handled in a completely different way.
A different encoding file may be needed for other languages, but this seems to work for Slovak.
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