similar to: recursion and lexical scoping

On 18/03/2023 1:57 p.m., akshay kulkarni wrote: > Dear members, > The documentation for source() says: > > Input is read and parsed from that file until the end of the file is reached, then the parsed expressions are evaluated sequentially in the chosen environment. > > What does this mean? I presume that any objects that are CREATED by the script

I am running into problems calling the library function nlme from within another function. Basically,the following function (with v a list containing data and initialization values) > testfunc function(dat=v) { test<-nlsList(result~a+(b-a)/(1+(conc/(c+z*cdiff))^d) |rep,start=dat$init,data=dat$mixeddat) return(nlme(test,random=b~1)) } produces the error message Error in eval(expr, envir,

Dear members, The documentation for source() says: Input is read and parsed from that file until the end of the file is reached, then the parsed expressions are evaluated sequentially in the chosen environment. What does this mean? I presume that any objects that are CREATED by the script are stored in the Global environment (if local = FALSE), but the rules for

Hello, Could someone please tell me what I am thinking about incorrectly: f <- function(y) { g <- function(x) x + y g } In the following, I get what I expect based on my understanding of lexical scoping: (f(1))(3) # 4 (f(2))(3) # 5 But now, fs <- lapply(c(1, 2), f) fs[[1]](3) # 5 (Why not 4 ?) fs[[2]](3) # 5 Checking the environments of these functions, I see that

Dear Duncun, thanks for the reply.... So when I run a script in the system command line by R CMD BATCH, the objects created in the script cannot be stored in the workspace ,right? If yes, how to save them? Moreover, the only way to save the objects CREATED from the script permanently is to save them to the disk, right? THanking you, yours sincerely, AKSHAY M KULKARNI

?search and ?environment See also "The R Language Definition" manual for similar such questions. -- Bert On Tue, Apr 4, 2023 at 6:56?AM akshay kulkarni <akshay_e4 at hotmail.com> wrote: > > Dear Members, > I have the following code typed at the console prompt: > > y <- x*10 > > X has not been defined and the above code

On 19/03/2023 2:33 p.m., akshay kulkarni wrote: > Dear Duncun, > ? ? ? ? ? ? ? ? ? ? ? ? ?thanks for the reply.... > > So when I run a script in the system command line by R CMD BATCH, the > objects created in the script cannot be stored in the workspace ,right? > If yes, how to save them? Moreover, the only way to save the objects > CREATED from the script permanently is

I've recently hunted down a troublesome bug in my own code, and am looking for an easy mechanism to detect this kind of error in other R code. The problem was an undefined variable inside of a function. Unfortunately, R looked for that variable in the global environment and found it since there was variable with that name in my testing scripts (note to self: do not name things "x").

R *does* search the environment stack. > search() [1] ".GlobalEnv" "package:stats" "package:graphics" [4] "package:grDevices" "package:utils" "package:datasets" [7] "package:methods" "Autoloads" "package:base What you seem to be missing is that a package may contain bindings that it

On 19/03/2023 2:55 p.m., akshay kulkarni wrote: > Dear Duncun, > ? ? ? ? ? ? ? ? ? ? ? ? ?What if there is no interactive "session" > running? I will be running my scripts automatically from crontab in Linux. I was talking about the session that is created for the duration of the BATCH run, not some other session that may be running in another process. Sorry for the

On 04/04/2023 9:56 a.m., akshay kulkarni wrote: > Dear Members, > I have the following code typed at the console prompt: > > y <- x*10 > > X has not been defined and the above code throws an object not found error. That is, the global environment does not contain x. Why doesn't it look further in the environment stack, like that of

Dear Deepayan, THanks for the pithy, pointed reply. But isn't it risky? Can I somehow get a warning when x is not defined in the global environment but takes on a value from one of the loaded packages? any packages for that? THanking you, Yours sincerely, AKSHAY M KULKARNI ________________________________ From: Deepayan Sarkar <deepayan.sarkar at

You can't change the basic way R searches, but you can ask for a different kind of search. For example, to see if "x" exists, you can use exists("x") and it will do the default search, but exists("x", inherits = FALSE) will only look in the current environment. The get() function has a similar argument which returns the value Unfortunately these

What do _you_ mean when you use the term "interactive"? Because R distinguishes between executing code in a function and executing code from the global environment, but it does not care whether a person is doing the typing or not. I get the feeling that you think of your R code in terms of "scripts" when you should be thinking of your code in terms of functions. What

Dear Duncun, What if there is no interactive "session" running? I will be running my scripts automatically from crontab in Linux. THanking you, Yours sincerely, AKSHAY M KULKARNI ________________________________ From: Duncan Murdoch <murdoch.duncan at gmail.com> Sent: Monday, March 20, 2023 12:20 AM To: akshay kulkarni <akshay_e4 at hotmail.com>; R

Dear Duncan, THanks for the reply...! So the takeaway is that define the symbol in the same environment before using it right!? Thanking you, Yours sincerely, AKSHAY M KULKARNI ________________________________ From: Duncan Murdoch <murdoch.duncan at gmail.com> Sent: Tuesday, April 4, 2023 8:21 PM To: akshay kulkarni <akshay_e4 at hotmail.com>; Deepayan Sarkar

Dear Jeff, I will not be running R command in the shell prompt. So there is no banner, no > prompt. Just running "myscript.R" from the shell prompt. or from crontab in Linux. I think you get the context..... thanking you, yours sincerely AKSHAY M KULKARNI ________________________________ From: Jeff Newmiller <jdnewmil at dcn.davis.ca.us> Sent: Monday, March

The following *might* be of use to you. If you can predict what the various function invocations will do, I think you have a reasonable grasp of how lexical scoping works in R (contrary or supplementary opinions welcome). It is the sort of thing you will find in the references also. If this is all obvious, sorry for wasting your time. ####################### search() ls() dat <- list(x =2)

Again, the answer is "interactivity does not matter". On March 19, 2023 12:54:28 PM PDT, akshay kulkarni <akshay_e4 at hotmail.com> wrote: >Dear Jeff, > I will not be running R command in the shell prompt. So there is no banner, no > prompt. Just running "myscript.R" from the shell prompt. or from crontab in Linux. I think you get the

No, there are lots of situations where that doesn't make sense. You don't want to have to define local copies of the functions from every package you use, for example. I think the takeaway is to learn how R scoping works, and keep things simple. That's one reason I tend to avoid "tidyverse" packages. There are a lot of really good ideas in those packages, but