Perhaps the following may be of use to you. Consider:
> f <- function(){ x <- 3; function(y) x+y} > x <- 5 ##What does this give? > f() ## Why? ## How about this? >f()(10) ## Why? ## If you remove "x <- 3" from the above, what will you get when you repeat the exercise? -- Bert On Mon, Jan 9, 2023 at 8:29 AM Bert Gunter <bgunter.4...@gmail.com> wrote: > Unless you do something special within a function, only the value(s) > returned are available to the caller. That is the essence of > functional-type programming languages. > > You need to read up on (function) environments in R . You can search on > this. ?function and its links also contain useful information, but it may > too terse to be explicable to you. There are of course many available > references on the internet. > > I believe your mental model for how R works is flawed, and you have some > homework to do to correct it. I may be wrong, naturally, but you can judge > by looking at some tutorials. > > -- Bert > > On Mon, Jan 9, 2023 at 6:47 AM akshay kulkarni <akshay...@hotmail.com> > wrote: > >> Dear members, >> I have the following code: >> >> > TB <- {x <- 3;y <- 5} >> > TB >> [1] 5 >> >> It is consistent with the documentation: For {, the result of the last >> expression evaluated. This has the visibility of the last evaluation. >> >> But both x AND y are created, but the "return value" is y. How can this >> be advantageous for solving practical problems? Specifically, consider the >> following code: >> >> F <- function(X) { expr; expr2; { expr5; expr7}; expr8;expr10} >> >> Both expr5 and expr7 are created, and are accessible by the code outside >> of the nested braces right? But the "return value" of the nested braces is >> expr7. So doesn't this mean that only expr7 should be accessible? Please >> help me entangle this (of course the return value of F is expr10, and all >> the other objects created by the preceding expressions are deleted. But >> expr5 is not, after the control passes outside of the nested braces!) >> >> Thanking you, >> Yours sincerely, >> AKSHAY M KULKARNI >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> 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. >> > [[alternative HTML version deleted]] ______________________________________________ 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.