your dataframe has X as a factor; convert to character vector and try again.
x$X <- as.character(x$X) Sent from my iPad On Jun 11, 2011, at 2:14, jour4life <jour4l...@gmail.com> wrote: > That's great! But, I guess I should have provided a better example for > my problem. The reason being that I did not consider strings. For > instance, in my case, I'm actually trying to add a value to a data frame > that looks like this: > > Obs X > 0 NA > 1 "01 001" > 2 "01 002" > 3 "01 003" > > And I am actually trying to get that specific "NA" value and convert it > to "00 000" so it can look like this: > > Obs X > 0 "00 000" > 1 "01 001" > 2 "01 002" > 3 "01 003" > > When I write the code you provided, I get this result: > > x[1,"X"]<-"00 000" > Warning message: > In `[<-.factor`(`*tmp*`, iseq, value = c(NA, 3L, 4L, 5L, 6L, 7L, : > > invalid factor level, NAs generated > > I am wondering what I am doing wrong and how to solve this problem. > > Thanks for all the help! > > Carlos > > > > On 6/10/2011 8:34 PM, jholtman [via R] wrote: >> you probably need to read the Introduction to R to understand indexing: >> >>> x >> Obs X Y Z >> 1 1 1 0 1 >> 2 2 0 0 1 >> 3 3 1 1 1 >> 4 4 0 1 1 >> 5 5 1 1 0 >> 6 6 0 0 0 >>> x[4, "Y"] <- 0 >>> x >> Obs X Y Z >> 1 1 1 0 1 >> 2 2 0 0 1 >> 3 3 1 1 1 >> 4 4 0 0 1 >> 5 5 1 1 0 >> 6 6 0 0 0 >> >> >> On Fri, Jun 10, 2011 at 5:42 PM, jour4life <[hidden email] >> </user/SendEmail.jtp?type=node&node=3589793&i=0>> wrote: >> >>> Hello all, >>> >>> I am wondering if there is a way to change the value of one cell in >> R. For >>> instance let's say I have a hypothetical data frame that looks like >> this: >>> >>> Obs X Y Z >>> 1 1 0 1 >>> 2 0 0 1 >>> 3 1 1 1 >>> 4 0 1 1 >>> 5 1 1 0 >>> 6 0 0 0 >>> >>> I would like to change the value of the 4th observation in the Y >> column from >>> 1 to 0. It should look like this: >>> >>> Obs X Y Z >>> 1 1 0 1 >>> 2 0 0 1 >>> 3 1 1 1 >>> 4 0 0 1 >>> 5 1 1 0 >>> 6 0 0 0 >>> >>> Is it possible to change the value in one command? >>> >>> Thanks, >>> >>> Carlos >>> >>> >>> -- >>> View this message in context: >> http://r.789695.n4.nabble.com/change-value-in-one-cell-tp3589456p3589456.html >>> Sent from the R help mailing list archive at Nabble.com. >>> >>> ______________________________________________ >>> [hidden email] </user/SendEmail.jtp?type=node&node=3589793&i=1> >> 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 >> Data Munger Guru >> >> What is the problem that you are trying to solve? >> >> ______________________________________________ >> [hidden email] </user/SendEmail.jtp?type=node&node=3589793&i=2> >> 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. >> >> >> ------------------------------------------------------------------------ >> If you reply to this email, your message will be added to the >> discussion below: >> http://r.789695.n4.nabble.com/change-value-in-one-cell-tp3589456p3589793.html >> >> >> To unsubscribe from change value in one cell, click here >> <http://r.789695.n4.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=3589456&code=am91cjRsaWZlQGdtYWlsLmNvbXwzNTg5NDU2fC0xNjIzNjcwNDM1>. >> >> > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/change-value-in-one-cell-tp3589456p3590037.html > Sent from the R help mailing list archive at Nabble.com. > [[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.
