[R] create many variables at one time~

[Greg Snow]

An easy and good way to make a bunch of variables is to store them in a list.  For example:

> mylist <- replicate(100, sample(1:100, 10), simplify=FALSE)
> id <- paste('id.',1:100, sep='')
> names(mylist) <- id
> sapply(mylist, median)
  id.1   id.2   id.3   id.4   id.5   id.6   id.7   id.8   id.9  id.10  id.11
  23.0   66.0   58.0   42.5   66.5   42.0   52.0   41.0   64.0   55.0   73.5
 id.12  id.13  id.14  id.15  id.16  id.17  id.18  id.19  id.20  id.21  id.22
  57.0   64.0   62.0   45.0   32.5   44.5   54.5   70.5   57.0   72.5   41.0
 id.23  id.24  id.25  id.26  id.27  id.28  id.29  id.30  id.31  id.32  id.33
  43.0   44.5   48.5   71.0   68.5   33.5   44.5   62.5   58.5   40.0   47.0
 id.34  id.35  id.36  id.37  id.38  id.39  id.40  id.41  id.42  id.43  id.44
  45.5   33.5   62.0   69.0   60.5   22.0   69.0   36.0   43.0   64.5   42.5
 id.45  id.46  id.47  id.48  id.49  id.50  id.51  id.52  id.53  id.54  id.55
  46.0   49.5   47.5   44.5   66.5   65.0   61.0   43.5   39.0   50.0   49.0
 id.56  id.57  id.58  id.59  id.60  id.61  id.62  id.63  id.64  id.65  id.66
  56.0   31.0   45.5   37.0   68.0   39.5   69.5   47.0   66.0   56.5   55.5
 id.67  id.68  id.69  id.70  id.71  id.72  id.73  id.74  id.75  id.76  id.77
  42.0   30.5   49.5   32.0   59.5   33.5   38.0   51.0   74.0   39.5   42.0
 id.78  id.79  id.80  id.81  id.82  id.83  id.84  id.85  id.86  id.87  id.88
  35.0   55.5   51.0   31.5   44.0   41.5   32.5   60.5   58.5   41.5   39.5
 id.89  id.90  id.91  id.92  id.93  id.94  id.95  id.96  id.97  id.98  id.99
  46.0   51.0   60.0   51.5   43.5   65.5   42.5   38.0   43.0   46.0   53.5
id.100
  41.0
>

Now what do you want to do with all of those variables?

________________________________________
From: r-help-bounces at r-project.org [r-help-bounces at r-project.org] On Behalf Of Manli Yan [manliyanrhelp at gmail.com]
Sent: Wednesday, June 04, 2008 4:52 PM
To: r-help at r-project.org
Subject: [R] create many variables at one time~

  I need to create 100 variable ,whose name is id.1,id.2~~~~id.100
  then I need to let a vector say id<-c(id.1,id.2....id.100)
  any easy way to do this?
  thanks a lot~

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