[R] Generating Data Sets -- Each with a Different Name

[apjaworski@mmm.com]

You need paste and assign functions.  Paste will create a sequence of names
and assign will give values to the variables with these names.

This modification of your loop should work

for(i in 1:N)
{
assign(paste("Random.Data.", i, sep=''), rnorm(10, 0, 1))
}

Cheers,

Andy

__________________________________
Andy Jaworski
Engineering Systems Technology Center
3M Center, 518-1-01
St. Paul, MN 55144-1000
-----
E-mail: apjaworski at mmm.com
Tel:  (651) 733-6092
Fax:  (651) 736-3122


|---------+-------------------------------->
|         |           Ken Kelley           |
|         |           <KKelley at nd.edu>     |
|         |           Sent by:             |
|         |           r-help-bounces at stat.m|
|         |           ath.ethz.ch          |
|         |                                |
|         |                                |
|         |           10/23/2003 17:09     |
|         |                                |
|---------+-------------------------------->
  >-----------------------------------------------------------------------------------------------------------------------------|
  |                                                                                                                             |
  |      To:       r-help at stat.math.ethz.ch                                                                                     |
  |      cc:                                                                                                                    |
  |      Subject:  [R] Generating Data Sets -- Each with a Different Name                                                       |
  >-----------------------------------------------------------------------------------------------------------------------------|




Hello all.

I was wondering if anyone had insight into how I might generate a large
number of data sets/vectors, where each of the data sets/vectors have a
different name?

For example, suppose I wanted to generate N data sets/vectors, each with a
different name such as:

Random.Data.1 <- rnorm(10, 0, 1)
Random.Data.2 <- rnorm(10, 0, 1)
Random.Data.3 <- rnorm(10, 0, 1)
             .                       .
             .                       .
             .                       .
Random.Data.N <- rnorm(10, 0, 1)

Because I don't want to name each data set/vector myself, I want some sort
of looping/automatic procedure to do it for me. However, I'm not sure how
to do this.

What I want is something conceptually analogous to the following:

for(i in 1:N)
{
Random.Data.i <- rnorm(10, 0, 1)
}

Note the "i" in the "Random.Data.i" vector. This is the value I want to
change for each iteration of the loop, so that I can have N data
sets/vectors automatically generated for me with different names.

Does anyone know of a method where I can accomplish such a procedure.
Thanks for your thoughts,
Ken

P.S. For those of you wondering why I would ever want to do such a thing,
it is because I need a large number of data sets to use in a Monte Carlo
study with specialized software. If I could do the simulation all is R,
then obviously I could loop the whole procedure. The program I am using has

a limited Monte Carlo facility where each of the (say 10,000) data sets
must be generated elsewhere.

______________________________________________
R-help at stat.math.ethz.ch mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help