[R] writing several command line in R console

[Henrik Bengtsson]

The R prompt should be though of as a one line editor or rather one
expression editor. You can not "step" between lines etc while editing an
expression. The "+" in front of each row placed there by R indicating
that even if you have typed ENTER the expression is not finished and
that R expect you to close it (normally by closing brackets, parentesis
etc). The "+" is just an indicator and will not be included in your
expression.

What you really want to do when you create functions etc is to write the
up in an external text editor, save them with the extension *.R, e.g.
"twosam.R", and the use source to read the function in to R, i.e. 

  > source("twosam.R")

Make sure to save your twosam.R file as *text*. If you're using Windows
you can use Notepad to do this. Also, you have to save the file in the
working directory of R. You can find the current working directory of R
by

  > getwd()

Alternatively, you'll have to specify the full path to the file when
using source

  > source("C:/My Documents/hb/twosam.R")

Hope this helps! 

Henrik Bengtsson

> -----Original Message-----
> From: r-help-admin at stat.math.ethz.ch 
> [mailto:r-help-admin at stat.math.ethz.ch] On Behalf Of Vincent 
> Stoliaroff
> Sent: den 4 mars 2003 13:36
> To: r-help at stat.math.ethz.ch
> Subject: [R] writing several command line in R console
> 
> 
> 
> Hi R lovers
> 
> I would like to know how to step to the next line in the R 
> console editor 
> without breaking the continuity of my code
> more clearly : if for example I write a function, so far i 
> have to write the 
> all code inside on the same line wich may become obscure as 
> the function is 
> more and more complex.
> I would like to do like in the example of the manuels:
> 
> >twosam <- function(y1, y2) {
>     n1  <- length(y1); n2  <- length(y2)
>     yb1 <- mean(y1);   yb2 <- mean(y2)    s1  <- var(y1);    
> s2  <- var(y2)
>     s <- ((n1-1)*s1 + (n2-1)*s2)/(n1+n2-2)
>     tst <- (yb1 - yb2)/sqrt(s2*(1/n1 + 1/n2))    tst  }
> 
> 
> all I can do is something like that:
> 
> >twosam <- function(y1, y2) {    n1  <- length(y1); n2  <- length(y2)
> 
> +    yb1 <- mean(y1);   yb2 <- mean(y2)    s1  <- var(y1);    
> s2  <- var(y2)
> +    s <- ((n1-1)*s1 + (n2-1)*s2)/(n1+n2-2)
> +   tst <- (yb1 - yb2)/sqrt(s2*(1/n1 + 1/n2))    tst  }
> 
> with the sign "+" in front of each line
> What does this sign mean? and how could I solve my problems Thanks
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list 
> http://www.stat.math.ethz.ch/mailman/listinfo/> r-help
> 
>