Dear Narua, Others might suggest other things but here are some of my points. In general it is not a good idea to call a function F as it is an abbreviation for FALSE. Also it might be a good idea to write your functions in a way that they check the length of the arguments and behave accordingly (if nothing else, with loops). It is really nice to take a look at the family of apply functions (although I also have problems with them sometimes).
I did not check, but you can try something like this ff <- function(m,k)((1/(sum(sqrt(1:m))))*sqrt(k)) FF <- function(m,i)(sum(ff(m,1:i))) x <- 1:4 sapply(x, ff, m=4) sapply(x, FF, m=4) Keep up with using R! :) Best, kd ________________________________________ Feladó: R-help [r-help-boun...@r-project.org] ; meghatalmazó: Narua [maria....@gmx.de] Küldve: 2015. május 24. 0:21 To: r-help@r-project.org Tárgy: [R] Problem with apply list to function: numerical expression has 4 elements: only the first used Hello , I want to try R for statistics. Therefore, I defined a function f with parameters m and k, which calculates a to sqrt(x) proportional density function: f <- function(m,k)((1/(sum(sqrt(1:m))))*sqrt(k)) A function F sums the results in order to get a distribution function: F <- function(m,i)(sum(f(m,1:i))) It works e.g. for m=4: > F(4,1) [1] 0.1627005 > F(4,4) [1] 1 If I want to see all results for m=4, I write > F(4,1:4) [1] 0.1627005 Warning message: In 1:i : numerical expression has 4 elements: only the first used what does the error message mean? and how can I solve it? I've already tried rapply but I get the same error and googled for a while but there is nowhere a satisfying answer Can someone help me here? many thanks in advance, Narua -- View this message in context: http://r.789695.n4.nabble.com/Problem-with-apply-list-to-function-numerical-expression-has-4-elements-only-the-first-used-tp4707588.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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 -- To UNSUBSCRIBE and more, see 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.
