Isn't this even easier? > X1 <- c(1:3) > X2 <- c(3, 4, 6) > X3 <- c(5, 6, 1) > Y <- 6*X1 + 7*X2 + 8*X3 > Y [1] 67 88 68
Or if you really need a function: > MakeY <- function(x, y, z) 6*x + 7*y + 8*z > MakeY(X1, X2, X3) [1] 67 88 68 ---------------------------------------------- David L Carlson Associate Professor of Anthropology Texas A&M University College Station, TX 77843-4352 -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of R. Michael Weylandt Sent: Wednesday, November 30, 2011 8:17 AM To: arunkumar1111 Cc: r-help@r-project.org Subject: Re: [R] how to call a function for each row Read ?apply This is easiest: df <- matrix(c(1,2,3,3,4,6,5,6,1), 3) apply(df, 1, function(x) 6*x[1]+7*x[2]+8*x[3]) But it's much more efficient to do it with matrix multiplication. In keeping with the best of tradition, this is left as an exercise to the reader. Michael On Wed, Nov 30, 2011 at 8:10 AM, arunkumar1111 <akpbond...@gmail.com> wrote: > Hi > > I have a data-frame which look like this > > X1 X2 X3 > 1 3 5 > 2 4 6 > 3 6 1 > > I want to apply a formula Y=6*X1 + 7*X2 + 8*X3 for every row > > > Thanks in Advance > > > > > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/how-to-call-a-function-for-each-row-tp41 > 22906p4122906.html Sent from the R help mailing list archive at > Nabble.com. > > ______________________________________________ > 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. ______________________________________________ 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.
