[R] Inputting Co-ordinates

[Sundar Dorai-Raj]

Louise,
  See answer below:
> 
> I am trying to input some co-ordinate sets into R of the form x,y by using
> lists.  The command I am using is:
> 
> p1 <- list(x=c(3445,563,646), y=c(234,567,456))
> 
> However the actual co-ordinate sets that I am trying to input have 305
> points each and I think that the program will not accept a command that is
> as long as necessary.  Is this so?  If this is the case can you tell me how
> to read the points in as a table but so that I can call on them as being p1,
> later in the program?

Why not just place the points in a text file? E.g.

x, y
3445, 234
563, 567
646, 456

Save the last four lines into a text file called `coords.csv' (no
quotes).

In R, use the commands:

> p1 <- read.csv("coords.csv",header=T)
> p1
     x   y
1 3445 234
2  563 567
3  646 456
> p1$x
[1] 3445  563  646
> p1$y
[1] 234 567 456
> p1.list <- as.list(p1)
> p1.list
$x
[1] 3445  563  646

$y
[1] 234 567 456

> 

See read.csv or read.table for more details.

Sundar

-- 

Sundar Dorai-Raj, Ph.D.
Statistical Methods Engineer
PDF Solutions, Inc.
Richardson TX
(972) 889-3085 x216
(214) 392-7619 cell
sundar.dorai-raj at pdf.com
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