启动R时会出现
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_MONETARY failed, using "C"
[R.app GUI 1.65 (6931) x86_64-apple-darwin13.4.0]
WARNING: You're 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.
解决：
1.打开Terminal （是终端，不是R窗口）
2.输入：defaults write org.R-project.R force.LANG en_US.UTF-8
3.关闭Terminal
4.启动R