There are a number of ways this might be approached.
Can you please give a sample of your data, and your desired output?
Are "5a" ... "5e" the only values that appear in that column, or are
there other values, "4e" for instance, that should stay the same
during your conversion?
Do you wish to use the numbers 1 to 5 in the processed column in
arithmetic processing, or are they just an enumeration of possible
values?
While you think about it, I direct your attention to the functions:
sub
factor
-Alex
On 23 Oct 2006, at 23:03, Kim Milferstedt wrote:
> Hello,
>
> in the data.frame "resultsfuzzy" I would like to replace the
> characters in the second column ("5a", "5b", ... "5e") with numbers
> from 1 to 5. The data.frame has 39150 entries. I seems to work on
> samples that are << nrow(resultsfuzzy) but it takes suspicously long.
>
> Do you have any suggestions how to make the character replacing
> more efficient?
>
> Code:
>
> for (i in 1:nrow(resultsfuzzy))
> {
> if (resultsfuzzy[i,2] == "5a"){resultsfuzzy[i,2] <- 1} else
> if (resultsfuzzy[i,2] == "5b"){resultsfuzzy[i,2] <- 2} else
> if (resultsfuzzy[i,2] == "5c"){resultsfuzzy[i,2] <- 3} else
> if (resultsfuzzy[i,2] == "5d"){resultsfuzzy[i,2] <- 4}
> else
> resultsfuzzy[i,2] <- 5
> }
>
> Thanks,
>
> Kim
>
> version
>
> platform i386-pc-mingw32
> arch i386
> os mingw32
> system i386, mingw32
> status
> major 2
> minor 2.1
> year 2005
> month 12
> day 20
> svn rev 36812
> language R
>
> __________________________________________
>
> Kim Milferstedt
> University of Illinois at Urbana-Champaign
> Department of Civil and Environmental Engineering
> 4125 Newmark Civil Engineering Laboratory
> 205 North Mathews Avenue MC-250
> Urbana, IL 61801
> USA
> phone: (001) 217 333-9663
> fax: (001) 217 333-6968
> email: [EMAIL PROTECTED]
> http://cee.uiuc.edu/research/morgenroth
>
> ______________________________________________
> [email protected] mailing list
> 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.
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