Dear all, I would really appreciate if somebody can help me to understand what does the phrase "Vectorize your function" mean? And what is the job of Vectorize() function in doing that? I have read many threads where experts suggest to Vectorize the function, which will speed up entire calculation (and more elegant ofcourse.)
I used to think that vectorizing function means, to create a function such a way so that if input(s) are vector then this function will also return a vector output (without having any extra effort like use of 'for' loop etc.) Is this understanding correct? Here I have tried 2 essentially similar functions: > fn1 <- function(x,y,z) return(x+y+z) > fn2 <- Vectorize(function(x,y,z) return(x+y+z), SIMPLIFY=TRUE) > fn1(1:3, 4:6,5) [1] 10 12 14 > fn2(1:3, 4:6,5) [1] 10 12 14 You see that, fn1() and fn2() is giving same answer (vectorized?) despite of the fact that fn1() is not wrapped within Vectorize() function. Therefore I want to know: what additional thing this Vectorize() function brings on the table? Thanks for your time. ______________________________________________ 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.
