Liaw, Andy
2003-Jun-09 12:18 UTC
[R] Basic question on applying a function to each row of a da taframe
Another neat way is: with(DF, foo(x, w)) HTH, Andy> -----Original Message----- > From: peter leonard [mailto:pfleonard at hotmail.com] > Sent: Sunday, June 08, 2003 4:35 PM > To: r-help at stat.math.ethz.ch > Subject: [R] Basic question on applying a function to each row of a > dataframe > > > Hi, > > I have a function foo(x,y) and a dataframe, DF, comprised of > two vectors, x > & w, as follows : > > x w > 1 1 1 > 2 2 1 > 3 3 1 > 4 4 1 > > etc > > > I would like to apply the function foo to each 'pair' within DF e.g > foo(1,1), foo(2,1), foo(3,1) etc > > I have tried > > >apply(DF,foo) > >apply(DF[,],foo) > >apply(DF[DF$x,DF$w],foo) > > > However, none of the above worked. Can anyone help ? > > Thanks in advance, > Peter > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help >------------------------------------------------------------------------------ Notice: This e-mail message, together with any attachments, cont... {{dropped}}
Ramzi Feghali
2003-Jun-09 13:37 UTC
[R] Basic question on applying a function to each row of a da taframe
Another another neat way is:>DF <- data.frame(x=1:4, y=rep(1,4)) > foo <- function(z,x,y)z[x]+z[y] > apply(DF,1,foo,x="x",y="y")1 2 3 4 2 3 4 5 or> DF <- data.frame(x=1:4, y=rep(1,4)) > foo <- function(z)z<-x+y > foo(DF)[1] 2 3 4 5 "Liaw, Andy" <andy_liaw@merck.com> wrote: Another neat way is: with(DF, foo(x, w)) HTH, Andy> -----Original Message----- > From: peter leonard [mailto:pfleonard@hotmail.com] > Sent: Sunday, June 08, 2003 4:35 PM > To: r-help@stat.math.ethz.ch > Subject: [R] Basic question on applying a function to each row of a > dataframe > > > Hi, > > I have a function foo(x,y) and a dataframe, DF, comprised of > two vectors, x > & w, as follows : > > x w > 1 1 1 > 2 2 1 > 3 3 1 > 4 4 1 > > etc > > > I would like to apply the function foo to each 'pair' within DF e.g > foo(1,1), foo(2,1), foo(3,1) etc > > I have tried > > >apply(DF,foo) > >apply(DF[,],foo) > >apply(DF[DF$x,DF$w],foo) > > > However, none of the above worked. Can anyone help ? > > Thanks in advance, > Peter > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help >------------------------------------------------------------------------------ Notice: This e-mail message, together with any attachments, cont... {{dropped}} ______________________________________________ R-help@stat.math.ethz.ch mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help --------------------------------- [[alternate HTML version deleted]]