Thanks this works. Only, I need to reference in the formula using indexes.
-----Original Message----- From: Dimitris Rizopoulos [mailto:d.rizopou...@erasmusmc.nl] Sent: 09 November 2010 13:22 To: Santosh Srinivas Cc: r-help@r-project.org Subject: Re: [R] Row-wise recurive function call try this: apply(data.matrix(a), 1, playFn) I hope it helps. Best, Dimitris On 11/9/2010 8:32 AM, Santosh Srinivas wrote: > Dear Group, > > I have a following dataset: >> a > A B C D > 1 22 3 31 40 > 2 26 31 36 32 > 3 3 7 49 16 > 4 24 40 27 26 > 5 20 45 47 0 > 6 34 43 11 18 > 7 48 48 24 2 > 8 3 16 39 48 > 9 20 49 7 21 > 10 17 36 47 10 > >> dput(a) > structure(list(A = c(22L, 26L, 3L, 24L, 20L, 34L, 48L, 3L, 20L, > 17L), B = c(3L, 31L, 7L, 40L, 45L, 43L, 48L, 16L, 49L, 36L), > C = c(31L, 36L, 49L, 27L, 47L, 11L, 24L, 39L, 7L, 47L), D = c(40L, > 32L, 16L, 26L, 0L, 18L, 2L, 48L, 21L, 10L)), .Names = c("A", > "B", "C", "D"), class = "data.frame", row.names = c(NA, -10L)) > > > I have a function that works off EVERY individual ROW to throw a result. > Like > > playFn<- function (x){ > + result = ((x$A+6*x$B)/(3*x$C)+20)*x$D > + return(result) > + } > > > I want to apply the function for every row .... can I use an "apply" > function ... tried but not been able to ... > e.g. print(rapply(a,playFn)) > > Please advise. > > Thanks, > S > > ______________________________________________ > 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. > -- Dimitris Rizopoulos Assistant Professor Department of Biostatistics Erasmus University Medical Center Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands Tel: +31/(0)10/7043478 Fax: +31/(0)10/7043014 Web: http://www.erasmusmc.nl/biostatistiek/ ______________________________________________ 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.
