I'd throw a browser() in at that point and see what colnames(newdf.int) gives you. If you have less columns than names this is likely the reason for the error. You can get the same error with:
colnames(mtcars) <- LETTERS Cheers,Tyler ---------------------------------------- > Date: Mon, 14 May 2012 11:35:07 -0700 > From: bhatt...@gmail.com > To: r-help@r-project.org > Subject: [R] Error in names(x) <- value: 'names' attribute must be the same > length as the vector > > Dear R-helpers, > > I am stuck on an error in R: When I run my code (below), I get this error > back: > > Error in names(x) <- value : > 'names' attribute must be the same length as the vector > > > Then when I use traceback(), R gives me back this in return: > > `colnames<-`(`*tmp*`, value = c(""Item", "Color" ,"Number", "Size")) > > > > I'm not exactly sure how to fix this problem. Any advice would be greatly > appreciated! > > Thanks, > Priya > > > MODIFIED CODE: > # Looping through a series of CSV files > for (c in csvfiles) > { > #A DF (prevdf) was created based on an initial csv file.. > #so the condition below states that if there are rows with NAs or the > number of rows in prevdf is zero > if( (apply(prevdf, 1, function(y) !sum(!is.na(y))==1) > 0) || > (nrow(prevdf) == 0) ) > { > #Open a new file > currentCSVFile <- read.csv(c, header=TRUE) > #pick only the few columns we want from the file > currentCSVFile <- data.frame(currentCSVFile$Item, > currentCSVFile$Color..type , currentCSVFile$Number..owned, > currentCSVFile$Size..shirt) > #rename the column names > colnames(currentCSVFile) <- c("Item", "Color" ,"Number", "Size") > > #find the rows in prevdf that do not have any values. (sum should be 1 > because the Item name is unique for every row) > NArows <- prevdf[apply(prevdf, 1, function(y) sum(!is.na(y))==1),] > > #if NAs rows is not equal to zero > if (nrow(NArows) != 0 ) > { > #find the rows in the current CSV file where there is missing data in > prevdf (this info is in NArows) > intersectItem<- intersect(currentCSVFile$Item, NArows$Item) > > #initiate another data frame to put the data in > newdf.int <- data.frame(Item=c(), Color=c(), Number=c(), Size=c()) > > > print(nrow(currentCSVFile)) > for (i in 1:nrow(currentCSVFile)) > > { > print("In loop") # check for me > row <- currentCSVFile[i,] > > if (row$Item %in% intersectItem){ # this is where the code stops > and throws back error > . > . > . > # do stuff to fill vectors named Item, Color, Number and Size > . > . > . > > newdf.int <-rbind(newdf.int, c(Item, Color, Number, Size) > } > > colnames(newdf.int) <- c("Item", "Color", "Number", "Size") > prevdf <- merge(newdf.int, prevdf, by=c("Item", "Color", "Number", > "Size"), all=TRUE) > prevdf <- prevdf[apply(prevdf, 1, function(y) !sum(!is.na(y))==1),] > print("after removing row = 1") > > > } # end of for loop > > } # end of NA rows condition > > } # end of main if statement > > else > { > break > } > > > } > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org 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. ______________________________________________ R-help@r-project.org 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.