Message-ID: <FAE2B32C-6C95-4208-9212-22148C4F8C90@exeter.ac.uk>
Date: 2009-03-23T17:52:41Z
From: Baptiste Auguie
Subject: Replacing a few variable values within a DataFrame...
In-Reply-To: <955009.41605.qm@web56002.mail.re3.yahoo.com>
On 23 Mar 2009, at 17:39, Jason Rupert wrote:
>
> I would like to replace a few varaibles within a data frame.
>
> For example, in the dataframe below (contrived) I would like to
> replace the current housesize value only if the Location is HSV.
> However, I would like to leave the other values intact.
>
How about,
test_data2_df[test_data2_df$Location=="HSV", ] # these are the values
to change
test_data2_df$housesize[test_data2_df$Location=="HSV"] <- 28.3 # or
whatever values
HTH,
baptiste
>
> I tried "ifelse", but I don't really need the else condition.
>
> test_data2_df<-data.frame(Variables=c("SQR Footage","SQR
> Footage","SQR Footage","SQR Footage","SQR Footage","SQR
> Footage","SQR Footage","SQR Footage","SQR Footage","SQR
> Footage","SQR Footage","SQR Footage","SQR Footage","SQR
> Footage","SQR Footage"),HouseSize=c(10, 20, 30, 40, 50, 15, 25, 35,
> 45, 55, 18, 28, 38, 48, 58), Lot=c(1, 2, 3, 4, 5, 10, 20, 30, 40,
> 50, 11, 21, 31, 41, 51), Location=c("HSV", "ATH", "HSV", "ATH", "FLO",
> "HSV", "ATH", "HSV", "ATH", "FLO",
> "HSV", "ATH", "HSV", "ATH",
> "FLO"))
>
> Moreover, I want to preserve the rest of the values within the
> data. I thought some combination using the subset would get me
> there, but I ended up with a long and ungangly looking code.
>
> Thanks for any help that is offered.
>
> ______________________________________________
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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.
_____________________________
Baptiste Augui?
School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK
Phone: +44 1392 264187
http://newton.ex.ac.uk/research/emag