打开 R 后显示红色 Waring ：
During startup - Warning messages:
1: Setting LC_CTYPE failed, using "C"
2: Setting LC_COLLATE failed, using "C"
3: Setting LC_TIME failed, using "C"
4: Setting LC_MESSAGES failed, using "C"
5: Setting LC_PAPER failed, using "C"
[R.app GUI 1.50 (6126) x86_64-apple-darwin9.8.0]
WARNING: You are using a non-UTF8 locale, therefore only ASCII characters will work.
Please read R for Mac OS X FAQ (see Help) section 9 and adjust your system
preferences accordingly. [History restored from /Users/mohammadgoodarzi/.Rapp.history]
处理方法：
首先在 R 中输入：
system("defaults write org.R-project.R force.LANG en_US.UTF-8")
然后在 系统终端中输入：
defaults write org.R-project.R force.LANG en_US.UTF-8
原因是系统 Shell 下的 locale 设置错误造成的，但是，你在 .bash_profile 或者 .bashrc 里设置 export LANG 和 export LC_ALL 都不是很管用
