How to install cran packages on Windows?

Question

I'm typing for example:

install.packages('TTR')

output is:

--- Please select a CRAN mirror for use in this session ---
trying URL 'http://mirrors.softliste.de/cran/bin/windows/contrib/2.12/TTR_0.20-2.zip'
Content type 'application/zip' length 237131 bytes (231 Kb)
opened URL
downloaded 231 Kb

package 'TTR' successfully unpacked and MD5 sums checked

The downloaded packages are in
        C:\Documents and Settings\Administrator\Local Settings\Temp\Rtmp33oIzT\downloaded_packages

But then, even after restarting environment functions belonging to that package aren't recognized, for example EMA() -> Error: could not find function "EMA". Is there any command command to actually install these downloaded packages.

There is "R CMD INSTALL" command to use in shell but when I type:

R CMD INSTALL TTR

I get:

Warning: invalid package 'TTR'
Error: ERROR: no packages specified

Solution 1

As hinted at in the comment, installing and gaining access to packages is a two step process. You've got the first step down with install.packages() but then you also need to load the library in your R script to gain access to those functions with library(YourPackageHere).

See this question for other details.

Solution 2

A copy of An Introduction to R comes with your R installation. Had you glanced at the Table of Contents, you would have seen the Packages section, where your question is answered in the second sentence.