Install Problem ＆ Solve
Error:
WARNING: Rtools is required to build R packages but is not currently installed. Please download and
install the appropriate version of Rtools before proceeding
Solve:
1.安装Rtools
2.配置rtools路径： 在R Studio运行代码：writeLines('PATH="${RTOOLS40_HOME}\\usr\\bin;${PATH}"',
con = "~/.Renviron")
3.关闭R Studio，重新打开
4.测试路径：运行代码：Sys.which("make") ； 输出结果类似："C:\\rtools40\\usr\\bin\\make.exe"
5.完成
Error:
jupyter-client has to be installed but “jupyter kernelspec --version” exited with code 127
Solve:
1.If Anaconda is installed and the Jupyter-Notebook with it (should be the standard install), open up
the Anaconda prompt, not the Windows command prompt or the Anaconda Navigator
2.Look up the executable of R (not Rgui or Rstudio), it should be somewhere like C:\Program Files\R\
R-3.5.1\bin and remember the path typing cd C:\Program Files\R\R-3.5.1\bin and start R by typing R
3.Typing IRkernel::installspec()
4.Now you can start an R kernel within Jupyter-Notebook
