[R] novice questions about programming in "R"

[John Fox]

Dear Richard,


> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Richard Evans
> Sent: Monday, February 06, 2006 4:35 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] novice questions about programming in "R"
> 
> folks, 
> 
> I have been struggling with the "R" documentation for too 
> long now and I need a simple answer on two questions. The 
> documentation does not have adequate examples. Please help. 
> 
> given two equal vector lists: 
>    A <- c(0,1,2,3) 
>    B <- c(5,6,7,8) 
> 
> [Question #1]
> how do I dump them to a text file with the following format: 
> ------------------------------------------------------------ 
> [line 1] 0.0000000    5.0000000 
> [line 2] 1.0000000    6.0000000 
> [line 3] 2.0000000    7.0000000 
> [line 4] 3.0000000    8.0000000 
> ------------------------------------------------------------ 


One way to do this is

Data <- cbind(A,B)
rownames(Data) <- paste("[line ", 1:4, "]", sep="")
write.table(formatC(Data, digits=7, format="f"), 
    file="c:/temp/test.txt", col.names=FALSE, quote=FALSE)

[Note that the two vectors are not lists and are not equal. If you don't
really want the line numbers in the file, then omit the second command and
use the argument row.names=FALSE to write.table().] 

> 
> [Question #2]
> ------------------------------------------------------------
> how do you make log-log plot that looks like it was plotted 
> on log-log graph paper? 
> ------------------------------------------------------------ 
>

plot(x, y, log="xy")

[I assume that you don't want the graph-paper grid, though you could add
that with abline(h=values, v=values, col="gray") if you do.]

I hope this helps,
 John

> many thanks,
> - revansx
> 
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