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...ot;, x, y); return 0; } $ gcc -Wall a.c $ ./a.out Starting... Done: x=2200, y=110 I don't like that syntax (e.g., commas between expressions instead of the usual semicolons after expressions). Perhaps John Chambers et all didn't either. -Bill On Fri, Jan 13, 2023 at 2:28 AM Valentin Petzel <valentin at petzel.at> wrote: > Hello Akshay, > > R is quite inspired by LISP, where this is a common thing. It is not in > fact that {...} returned something, rather any expression evalulates to > some value, and for a compound statement that is the last evaluated > expre...

...We are living in the 21st?century world, and the R-core team might,I suppose, have a definite reason for"returning" the last value. Any comments? > > Thanking you, > Yours sincerely, > AKSHAY M KULKARNI > > ---------------------------------------- > *From:* Valentin Petzel <valentin at petzel.at> > *Sent:* Monday, January 9, 2023 9:18 PM > *To:* akshay kulkarni <akshay_e4 at hotmail.com> > *Cc:* R help Mailing list <r-help at r-project.org> > *Subject:* Re: [R] return value of {....} > ? > Hello Akshai, > > I think you are c...

...urning the last, or any value, is redundant? We are living in the 21st century world, and the R-core team might,I suppose, have a definite reason for"returning" the last value. Any comments? Thanking you, Yours sincerely, AKSHAY M KULKARNI ________________________________ From: Valentin Petzel <valentin at petzel.at> Sent: Monday, January 9, 2023 9:18 PM To: akshay kulkarni <akshay_e4 at hotmail.com> Cc: R help Mailing list <r-help at r-project.org> Subject: Re: [R] return value of {....} Hello Akshai, I think you are confusing {...} with local({...}). This one will e...

...> z <- .Last.value/2 > z [1] 10.5 Yes, you could have used "y" ... -----Original Message----- From: R-help <r-help-bounces at r-project.org <mailto:r-help-bounces at r-project.org> > On Behalf Of akshay kulkarni Sent: Monday, January 9, 2023 12:06 PM To: Valentin Petzel <valentin at petzel.at <mailto:valentin at petzel.at> > Cc: R help Mailing list <r-help at r-project.org <mailto:r-help at r-project.org> > Subject: Re: [R] return value of {....} Dear Valentin, But why should {....} "return" a value? It...

...? We are living in the 21st century > world, and the R-core team might,I suppose, have a definite reason > for"returning" the last value. Any comments? > > Thanking you, > Yours sincerely, > AKSHAY M KULKARNI > > ________________________________ > From: Valentin Petzel <valentin at petzel.at> > Sent: Monday, January 9, 2023 9:18 PM > To: akshay kulkarni <akshay_e4 at hotmail.com> > Cc: R help Mailing list <r-help at r-project.org> > Subject: Re: [R] return value of {....} > > Hello Akshai, > > I think you are confusing {....

...variables in R. > x <- 0 > g <- function () { + n <- 10 + r <- numeric(n) + for (i in 1:n) { + if (i == 6) x <- 100 + r[i] <- x + i + } + r + } > g() [1] 1 2 3 4 5 106 107 108 109 110 On Fri, 13 Jan 2023 at 23:28, Valentin Petzel <valentin at petzel.at> wrote: > Hello Akshay, > > R is quite inspired by LISP, where this is a common thing. It is not in > fact that {...} returned something, rather any expression evalulates to > some value, and for a compound statement that is the last evaluated > expre...

...euse in another context: > y = x*2 + 2*x -3 > z <- .Last.value/2 > z [1] 10.5 Yes, you could have used "y" ... -----Original Message----- From: R-help <r-help-bounces at r-project.org> On Behalf Of akshay kulkarni Sent: Monday, January 9, 2023 12:06 PM To: Valentin Petzel <valentin at petzel.at> Cc: R help Mailing list <r-help at r-project.org> Subject: Re: [R] return value of {....} Dear Valentin, But why should {....} "return" a value? It could just as well evaluate all the expressions and store the resulting object...

...euse in another context: > y = x*2 + 2*x -3 > z <- .Last.value/2 > z [1] 10.5 Yes, you could have used "y" ... -----Original Message----- From: R-help <r-help-bounces at r-project.org> On Behalf Of akshay kulkarni Sent: Monday, January 9, 2023 12:06 PM To: Valentin Petzel <valentin at petzel.at> Cc: R help Mailing list <r-help at r-project.org> Subject: Re: [R] return value of {....} Dear Valentin, But why should {....} "return" a value? It could just as well evaluate all the expressions and store the resulting object...

...s a parameter as in example above. b <- 100 myNGfunction(y) John ________________________________________ From: R-help <r-help-bounces at r-project.org> on behalf of Sorkin, John <jsorkin at som.umaryland.edu> Sent: Sunday, January 15, 2023 7:40 PM To: Richard O'Keefe; Valentin Petzel Cc: R help Mailing list Subject: Re: [R] return value of {....} Richard, A slight addition to your code shows an important aspect of R, local vs. global variables: x <- 137 f <- function () { a <- x x <- 42 b <- x list(a=a, b=b) } f() print(x) _____...

...a <- x x <- 42 b <- x list(a=a, b=b) } f() print(x) ________________________________________ From: R-help <r-help-bounces at r-project.org> on behalf of Richard O'Keefe <raoknz at gmail.com> Sent: Sunday, January 15, 2023 6:39 PM To: Valentin Petzel Cc: R help Mailing list Subject: Re: [R] return value of {....} I wonder if the real confusino is not R's scope rules? (begin .) is not Lisp, it's Scheme (a major Lisp dialect), and in Scheme, (begin (define x ...) (define y ...) ...) declares variables x and y that are local to the (begin...

...n the tidyverse because they manage to make some changes, for better and often for verse. -----Original Message----- From: R-help <r-help-bounces at r-project.org> On Behalf Of Sorkin, John Sent: Sunday, January 15, 2023 8:08 PM To: Richard O'Keefe <raoknz at gmail.com>; Valentin Petzel <valentin at petzel.at> Cc: R help Mailing list <r-help at r-project.org> Subject: Re: [R] return value of {....} Richard, I sent my prior email too quickly: A slight addition to your code shows an important aspect of R, local vs. global variables: x <- 137 f <- function () {...

...hose name starts with "th" newdata2 <- mydata[,-ColumnToDelete] cat("Data frame after droping column whose name is three\n") newdata2 I hope this helps. John ________________________________________ From: R-help <r-help-bounces at r-project.org> on behalf of Valentin Petzel <valentin at petzel.at> Sent: Saturday, January 14, 2023 1:21 PM To: avi.e.gross at gmail.com Cc: 'R-help Mailing List' Subject: Re: [R] Removing variables from data frame with a wile card Hello Avi, while something like d$something <- ... may seem like you're directly modify...

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?

...n these methods. Many programming languages have some qualms (I mean designers and programmers, and just plain purists) about when "pointers" of sorts are used and whether things should be mutable and so on so I prefer to avoid religious wars. -----Original Message----- From: Valentin Petzel <valentin at petzel.at> Sent: Saturday, January 14, 2023 1:21 PM To: avi.e.gross at gmail.com Cc: 'R-help Mailing List' <r-help at r-project.org> Subject: Re: [R] Removing variables from data frame with a wile card Hello Avi, while something like d$something <- ... may see...

Hello Avi, while something like d$something <- ... may seem like you're directly modifying the data it does not actually do so. Most R objects try to be immutable, that is, the object may not change after creation. This guarantees that if you have a binding for same object the object won't change sneakily. There is a data structure that is in fact mutable which are environments. For

Steven, Just want to add a few things to what people wrote. In base R, the methods mentioned will let you make a copy of your original DF that is missing the items you are selecting that match your pattern. That is fine. For some purposes, you want to keep the original data.frame and remove a column within it. You can do that in several ways but the simplest is something where you sat the

Hello, I have search up and down about this problem and I have since a lot of posts of people who have had the problem but no solutions so I am posting here hoping that someone can help me out. Here is the scenario. I have Samba Version 3.010 running on Ubuntu 5.04. Everything is working very well with the exception of one item. I have created a shared and when I create a new folder I have