#问题如下， 谢谢帮忙了；
#参考：https://gist.github.com/stephenturner/4a599dbf120f380d38e7
#想画出：Volcano plot

getwd()#check the workign directory;
[1] "C:/Program Files/RStudio"

> setwd("C:/N/R-3.1.1/bin/i386");#the R install path;

> getwd()[1] "C:/N/R-3.1.1/bin/i386"

> install.packages('devtools');
trying URL 'http://cran.rstudio.com/bin/windows/contrib/3.1/devtools_1.6.1.zip'Content type 'application/zip' length 284100 bytes (277 Kb)opened URLdownloaded 277 Kbpackage ‘devtools’ successfully unpacked and MD5 sums checkedThe downloaded binary packages are in        C:\Users\suzh3\AppData\Local\Temp\RtmpM5LH46\downloaded_packages

> library(devtools);#为啥这次会出错；
WARNING: Rtools is required to build R packages, but is not currently installed.Please download and install Rtools 3.1 from http://cran.r-project.org/bin/windows/Rtools/ and then run find_rtools().

> library(devtools);#这次就没有问题了， 怎么回事？

> devtools::install_github('stephenturner/Tmisc')#想装这个包，为啥不行？
Downloading github repo stephenturner/Tmisc@masterError in function (type, msg, asError = TRUE)  :   Could not resolve host: api.github.com; Host not found