Replacing a few variable values within a DataFrame...

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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_____________________________

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

Replacing a few variable values within a DataFrame...

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