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-tp4122906p4122906.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.
