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Hi, I am writing a function that includes 'sum' function such as: f<-function(x){ c<-c(-1,0,1) f<-sum(c+x) } expecting f to be -1+x+0+x+1+x=3x. But I found out that f is sum(x). So, f is always a scalar, which means that f(c(0,1)) is not a vector as c(0,3), but 3(0+1)=3. I would like to ask you helping me in solving this problem. I would like to thank you in advance. Sungsu.

Hi, I am writing a function that includes 'sum' function such as: f<-function(x){ c<-c(-1,0,1) f<-sum(c+x) } expecting f to be -1+x+0+x+1+x=3x. But I found out that f is sum(x). So, f is always a scalar, which means that f(c(0,1)) is not a vector as c(0,3), but 3(0+1)=3. I would like to ask you helping me in solving this problem. I would like to thank you in advance. Sungsu.

Dear R users. I have data observed on the surface of a torus, and am trying to fit the nonlinear regression using the geodesic equation on a torus. Could anyone give me a helpful advise on this problem? I would definitely appreicate your reply. Sincerely, SUNGSU KIM [[alternative HTML version deleted]]

Dear R users. I have written my R code. It runs in the version 2.3.1, but not in the version 2.5.1. The error message is shown below. Error in .Fortran("DEPTH", u, v, as.integer(size), as.single(x), as.single(y), : Fortran symbol name "depth" not in load table Could any one advise me what I could do to run my code in 2.5.1? Sincerely,