问题
I am getting this response when trying to install the R package:
>installed.packages("reshape2")
Package LibPath Version Priority Depends Imports LinkingTo Suggests Enhances
License License_is_FOSS License_restricts_use OS_type Archs MD5sum
NeedsCompilation Built
R version 3.2.2 (2015-08-14) Platform: x86_64-w64-mingw32/x64 (64-bit) Running under: Windows 8 x64 (build 9200)
回答1:
The function you have called is not used to download packages.
installed.packages returns information about packages available to R. The first argument defines places where the function will be looking for packages. Unless there is reshape2 directory in your current working directory that happens to contain some valid packages, the function will return nothing.
If you want to download and install package, use install.packages:
install.packages("reshape2")
If you want to download package (but not install it), use download.packages.
来源：https://stackoverflow.com/questions/34473256/i-am-unable-to-download-the-reshape2-package-in-r