r - updating column values when table name is a variable -


first question here, , new r well.

i have loop creating data frames according list of studytables. can read csvs fine, field "subject" , add variable "study" before in field. trouble 2nd "assign" line, can't r assign new value "subject".

thanks help.

study <- 'study10' studytables <- list('ae', 'subject') studypath <- 'c:/mypath/'  for(table in studytables) {   destinframe <- paste(table,study, sep='')   file <- paste(studypath, table, '.csv', sep='' )   assign(destinframe, read.csv(file)) # create dataframes    assign(destinframe['subject'], rep('testing', nrow(get(destinframe)))) }

using assign isn't great idea. , can see doesn't work when try add columns data.frame. it's better add columns before assign. replace

assign(destinframe, read.csv(file)) assign(destinframe['subject'], rep('testing', nrow(get(destinframe))))

with 

dd <- read.csv(file) dd$subject <- paste(study, dd$subject) assign(destinframe, dd)

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