My situation is that I am attempting to write a data frame consisting of columns that have differing data types to a csv file in R. The code I use to write the file is:
filename = file("equipment.csv")
write.csv(file = filename, x = equipment, quote = FALSE, row.names = FALSE )
This causes problems later when I try to load the csv file into a SQL database since some of the columns contain strings that contain ','. If I set quote = TRUE in the above code, it creates problems for my numeric data types when I load to the data base.
My question: is there a way to control the way that R adds quotes to the columns when writing csv files? I would like to be able to add quotes around the strings but not to the other data types.
Many thanks for your help.
Specify which columns you want quoted like this
write.csv(file = filename, x = equipment, quote = c(2,3), row.names = FALSE )
PS: if you want to automatically work out which columns to leave alone, you can do it like this:
non_numerics<-adply(1:ncol(equipment),1,function(x)print(is.numeric(equipment[,x])))
quote_val<-as.numeric(array(non_numerics[which(!non_numerics$V1),1]))
filename = file("equipment.csv")
write.csv(file = filename, x = equipment, quote = quote_val, row.names = FALSE )
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