Re: [R] R for loop question

From: Erik Iverson <iverson_at_biostat.wisc.edu>
Date: Tue, 20 May 2008 14:52:54 -0500

Take a look at ?assign

Juan Manuel Barreneche wrote:
> I had to do the same thing many times, i usually use a combination of the
> functions "eval", "parse" and "sprinf", as below:
>
> k <- 1
> for (i in 1:length(stats$hour)) {
> eval(parse(text=sprintf("x%s <- dataset[%s,(3:15)]", i, k)))
> k <- k+1
> }
>
> what it does is:
> eval(parse(text=STRING)) is a way to execute what is written on STRING
> and
> sprintf("TEXT%sTEXT", VARIABLE) substitutes the %s part of the text in the
> first argument for whatever is on the second argument (you can extend this to
> many %s parts)
>
> Note: i've changed the "=" for the "<-" because someone told me that it was
> more correct (don't ask me why though!).
>
> JM
>
> El Martes, 20 de Mayo de 2008 13:58, Douglas M. Hultstrand escribió:

>> Hello,
>>
>> I am trying to assign a variable name (x1,x2,x3...) in a loop statement
>> that is based on a counter (counter is based on the number of hours
>> within the datafile).  The x1,x2 data will later be called for plotting
>> the data.  Below is a clip of the for loop I am using, any suggestions?
>>
>> k = 1
>> for (i in 1:length(stats$hour)) {
>>   "x(i)" = dataset[k,(3:15)]
>>   k = k+1
>>  }
>>
>> Thanks,
>> Doug

>
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Tue 20 May 2008 - 19:55:29 GMT

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