LESSON-1A
by A. Mani
Introduction:
See ''scistatRred.pdf'', below and http://cran.r-project.org/doc/manuals/R-intro.pdf .
Installation:
For most ordinary purposes, there is no special need to compile R from source. Simply use the packages provided by your Linux/ BSD distribution. Install core packages and any number of ''R libraries''. Some libraries may not be available in your distribution.
#su
#R
>install.packages()
Getting Help:
#R
#help.start() - For html help
#help(command)
#help(plot)
You can search cran and also subscribe to their various (high traffic) mailing lists.
IDE:
> library (Rcmdr)
This is how you start Rcmdr (or load a package into R).
Rcmdr is useful for running and debugging code, but not exactly for writing it. You will however need to learn CLI methods as well.
Recommended Editors: Emacs, Kate, Vim or any of your favourite programming editors (with mark up for R)
R Scripts :
R scripts need to saved with .R extension.
Example : sym.R
> x <- 5+9*5
> x
You can do this on the CLI or put them on a file and ''source'' them.
Exercise-1: Do it.
Exercise-2: Write a R script including all arithmetic operations.
Exercise-3: Explain each LOC in the following:
>x <- c(1,3,7, 9, 2)
>is.integer(x)
>y <- as.integer(x)
>y
>z <- (as.vector(x))*(as.vector(x))
>z
