R help - Apr 2012 - Dynamic Variable Names?

Hi, I've written some R code that runs through a loop a certain number of
times.  I want to save the output of each loop under a new variable name,
but I seem unable to do so.

I have a [10,1] matrix of stock tickers, and I want to save the output to
the variable name: paste(matrix[i,1],"rets",sep="").  
Eg: AAPLrets would be the name of the variable that I would save the output
to.
Ideally after the script runs it would have saved 10 output to 10 different
variable names. 
Any suggestions on how to do so?

Thanks.


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On 14-04-2012, at 15:16, johnny123 wrote:
> Hi, I've written some R code that runs through a loop a certain number
of
> times.  I want to save the output of each loop under a new variable name,
> but I seem unable to do so.
> 
> I have a [10,1] matrix of stock tickers, and I want to save the output to
> the variable name: paste(matrix[i,1],"rets",sep="").  
> Eg: AAPLrets would be the name of the variable that I would save the output
> to.
> Ideally after the script runs it would have saved 10 output to 10 different
> variable names. 
> Any suggestions on how to do so?
> 
?assign

or consider a list.

Berend

Use lists.

e.g.
results <- lapply(1:10,function(i,...){ do stufff } )

will give you a list of results that you can name if you wish to.

You can also explicitly fill the list with the loop if you don't like
lapply -- some folks don't like anonymous functions, for example,
along the lines of:

results <- vector("list:,10)
for(i in 1:10) results[[i]] <- {whatever(i)}

but my aesthetic sense is somehow more offended by this.

Cheers,
Bert

On Sat, Apr 14, 2012 at 6:16 AM, johnny123 <johnny123 at dispostable.com>
wrote:
> Hi, I've written some R code that runs through a loop a certain number
of
> times. ?I want to save the output of each loop under a new variable name,
> but I seem unable to do so.
>
> I have a [10,1] matrix of stock tickers, and I want to save the output to
> the variable name: paste(matrix[i,1],"rets",sep="").
> Eg: AAPLrets would be the name of the variable that I would save the output
> to.
> Ideally after the script runs it would have saved 10 output to 10 different
> variable names.
> Any suggestions on how to do so?
>
> Thanks.
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Dynamic-Variable-Names-tp4557189p4557189.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.


-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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