[R] Programming/scripting with "expressions - variables"

[james.holtman@convergys.com]

Here is one way.  It is the custom to return a value that will be assigned
to the variable, so I changed your 'macro' to a function that returns the
value and then assigns it to your variable:

> test <- function(name, value){
+     .result <- NULL # initialize to NULL
+     .result[name] <- value
+     .result[paste('other_', name, sep='')] <- paste("other_", value,
sep='')
+     .result
+ }
> Gregor <- test('Gorjanc', '25')
> Gregor    # print out the vector
      Gorjanc other_Gorjanc
         "25"    "other_25"
>
__________________________________________________________
James Holtman        "What is the problem you are trying to solve?"
Executive Technical Consultant  --  Office of Technology, Convergys
james.holtman at convergys.com
+1 (513) 723-2929


                                                                                                                                           
                      "Gorjanc Gregor"                                                                                                     
                      <Gregor.Gorjanc at bfro.        To:       <r-help at stat.math.ethz.ch>                                                    
                      uni-lj.si>                   cc:                                                                                     
                      Sent by:                     Subject:  [R] Programming/scripting  with "expressions - variables"                     
                      r-help-bounces at stat.m                                                                                                
                      ath.ethz.ch                                                                                                          
                                                                                                                                           
                                                                                                                                           
                      02/07/2005 09:52                                                                                                     
                                                                                                                                           
                                                                                                                                           




Hello to Rusers!

I am puzzled with R and I really do not know where to look
in for my problem. I am moving from SAS and I have difficulties
in translating SAS to R world. I hope I will get some hints
or pointers so I can study from there on.

I would like to do something like this. In SAS I can write
a macro as example bellow, which is afcourse a silly one but
shows what I don't know how to do in R.

%macro test(data, colname, colvalue);
    data &data;
        ...
        &colname="&colvalue";
        other_&colname="other_&colvalue";
    run;
%mend;

And if I run it with this call:
%test(Gregor, Gorjanc, 25);

I get a table with name 'Gregor' and columns 'Gorjanc',
and 'other_Gorjanc' with values:

Gorjanc other_Gorjanc
"25"    "other_25"

So can one show me the way to do the same thing in R?

Thanks!

--
Lep pozdrav / With regards,
    Gregor GORJANC

---------------------------------------------------------------
University of Ljubljana
Biotechnical Faculty       URI: http://www.bfro.uni-lj.si
Zootechnical Department    email: gregor.gorjanc <at> bfro.uni-lj.si
Groblje 3                  tel: +386 (0)1 72 17 861
SI-1230 Domzale            fax: +386 (0)1 72 17 888
Slovenia

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