Hello,
I have noticed a behavior that I don't understand. When I call the
following function from the prompt.
test <- function(){
a <- readline("selection: ")
a
}
> test()
> selection: |
I can only type one character and the readline function exits before I can
press enter.
however
test1 <- function(){
a <- readline("selection:")
a
}> test1()
> selection:|
works as expected.> selection: abc[Ret]
However calling directly readline with a space in the prompt does what I
would expect.
> a <- readline("selection: ")
> selection: abc[Ret]
> a
> "abc"
It is the expected behavior or am I missing something?
Best regards,
Jeremie
--
Jeremie Juste> R version 4.0.3 (2020-10-10)
Hi Jeremie,
Try this:
test <- function() {
a<-readline("selection: ")
return(a)
}
If it starts working, it could be a difference in the way Windows R
handles text input. Both work okay for me on fedora linux.
Jim
On Tue, Feb 9, 2021 at 12:29 AM Jeremie Juste <jeremiejuste at gmail.com>
wrote:>
> Hello,
>
> I have noticed a behavior that I don't understand. When I call the
> following function from the prompt.
> test <- function(){
> a <- readline("selection: ")
> a
> }
>
> > test()
> > selection: |
> I can only type one character and the readline function exits before I can
> press enter.
>
> however
>
> test1 <- function(){
> a <- readline("selection:")
> a
> }
> > test1()
> > selection:|
> works as expected.
> > selection: abc[Ret]
>
> However calling directly readline with a space in the prompt does what I
> would expect.
>
> > a <- readline("selection: ")
> > selection: abc[Ret]
> > a
> > "abc"
>
> It is the expected behavior or am I missing something?
>
> Best regards,
> Jeremie
> --
> Jeremie Juste
> > R version 4.0.3 (2020-10-10)
>
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http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
On Mon, 08 Feb 2021 14:28:33 +0100 Jeremie Juste <jeremiejuste at gmail.com> wrote:> Hello, > > I have noticed a behavior that I don't understand. When I call the > following function from the prompt. > test <- function(){ > a <- readline("selection: ") > a > } > > > test() > > selection: | > I can only type one character and the readline function exits before > I can press enter. > > however > > test1 <- function(){ > a <- readline("selection:") > a > } > > test1() > > selection:| > works as expected. > > selection: abc[Ret] > > However calling directly readline with a space in the prompt does > what I would expect. > > > a <- readline("selection: ") > > selection: abc[Ret] > > a > > "abc" > > It is the expected behavior or am I missing something?Works fine for me, with or without the space in the prompt string. There *must* be something flaky in your system, but I'm damned if I can come up with any useful suggestions for tracking down just where that flakiness lies. Sorry. Perhaps try re-installing R??? cheers, Rolf Turner -- Honorary Research Fellow Department of Statistics University of Auckland Phone: +64-9-373-7599 ext. 88276
>>>>> Jeremie Juste >>>>> on Mon, 08 Feb 2021 14:28:33 +0100 writes:> Hello, > I have noticed a behavior that I don't understand. When I call the > following function from the prompt. > test <- function(){ > a <- readline("selection: ") > a > } >> test() >> selection: | > I can only type one character and the readline function exits before I can > press enter. > however > test1 <- function(){ > a <- readline("selection:") > a > } >> test1() >> selection:| > works as expected. >> selection: abc[Ret] > However calling directly readline with a space in the prompt does what I > would expect. >> a <- readline("selection: ") >> selection: abc[Ret] >> a >> "abc" > It is the expected behavior or am I missing something? > Best regards, > Jeremie > -- > Jeremie Juste >> R version 4.0.3 (2020-10-10) Given that the above works fine in Linux (for Jim Lemon and Rolf Turner), could you tell us *how* you use R? In the (Windows) RGui or from Rstudio or ESS or yet another way? Usually the UI (user interface) should not matter, but rather the R version etc. But the UI may be important for a function like readline() which does UI .. Martin