Here is one way. You might want to read in the data with 'as.is=TRUE' to prevent conversion to factors.
> x <- data.frame(a=c(1,2,3,'.',5,'.')) > str(x) 'data.frame': 6 obs. of 1 variable: $ a: Factor w/ 5 levels ".","1","2","3",..: 2 3 4 1 5 1 > # replace '.' with zero; either readin with 'as.is=TRUE' or convert to > character > x$a <- as.character(x$a) > x$a[x$a == '.'] <- '0' > x$a <- as.numeric(x$a) > str(x) 'data.frame': 6 obs. of 1 variable: $ a: num 1 2 3 0 5 0 > > On 9/5/07, Dieter Best <[EMAIL PROTECTED]> wrote: > Hello, > I read in a tab delimited text file via mydata = read.delim(myfile). The > text file was originally an excel file where . was used in place of 0. Now > all the columns which should be integers are factors. Any ideas how to change > all the . to 0 and factors back to integer? > Thanks a lot in advance for any suggestions, > -- D > > > --------------------------------- > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@stat.math.ethz.ch 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. > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? ______________________________________________ R-help@stat.math.ethz.ch 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.
