Maybe each dataframe you are adding during the loop include the column name.
I would add 
write.csv(mydata, file= “data.csv”=F, append=T,col.names=F)
Hope that help

Carlos



________________________________

To: r-help@r-project.org
Sent: Monday, April 20, 2009 4:39:48 PM
Subject: [R]  Append to a csv file


I am looping over a data set and at each loop I am creating a dataframe
“mydata”
That I wanted to be saves in a .csv file, but I want all the results to be
saved in the same file and this is the way I do it

write.csv(mydata, file= “data.csv”=F, append=T) . the csv file looks fine
but I always get the following warning message


Warning messages:
1: In write.table(mydata, file =”data.csv”,  ... :
  appending column names to file


Does anyone see why R print out this warning message?




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