R help - Nov 2020 - Printing upon calling a function

Thanks. I know, my point was on why I get something printed by simply 
doing line 1 below and at other occasions had to do line 2.

me.probit(obj)

v<-me.probit(obj); v

On 2020/11/30 ?? 05:33, Jim Lemon wrote:
> Hi Steven,
> You seem to be assigning the result of me.oprobit(obj) to v instead of
> printing it. By appending ";v" tp that command line, you
implicitly
> call "print".
>
> Jim
>
> On Mon, Nov 30, 2020 at 7:15 PM Steven Yen <styen at ntu.edu.tw>
wrote:
>> I hope I can get away without presenting a replicable set of codes
>> because doing so would impose burdens.
>>
>> I call a function which return a data frame, with the final line
>>
>> return(out)
>>
>> In one case the data frame gets printed (similar to a regression
>> printout), with simply a call
>>
>> me.probit(obj)
>>
>> In another case with a similar function, I could not get the results
>> printed and the only way to print is to do the following:
>>
>> v<-me.oprobit(obj); v
>>
>> This is a puzzle, and I hope to find some clues. Thanks to all.
>>
>> My function looks like the following:
>>
>> me.oprobit0 <- function(obj,mean=FALSE,vb.method,jindex=NA,
>> resampling=FALSE,ndraws=100,mc.method=1,times100=TRUE,
>>                           Stata.mu=FALSE,testing=FALSE,digits=3){
>> ...
>> return(out) # out is a data frame
>> }
>>
>> ______________________________________________
>> R-help at 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.

> On 30 Nov 2020, at 10:41, Steven Yen <styen at ntu.edu.tw> wrote:
> 
> Thanks. I know, my point was on why I get something printed by simply doing
line 1 below and at other occasions had to do line 2.
> 
> me.probit(obj)
That means the return value of me.probit() has been marked as invisible, so it
won't auto-print.  You have to use an explicit print

	print(me.probit(obj))

or use your work-around to convince R that you actually meant to print the
output.

If you dig through the full code of me.probit(), you'll probably find the
function invisible() called somewhere.

Best,
Stefan

TOPIC: Why some returned values do not automatically print.

Again, not seeing the internals, my guess is the function returned not the
expected but "invisible(expected)" which just marks it as not to be
automatically printed.

So if you want it printed, ask for it explicitly as in:

print(me.probit(obj))

What you did was to copy the object and then the copy does not keep the
invisibility so when invoked, gets the default print action.


-----Original Message-----
From: R-help <r-help-bounces at r-project.org> On Behalf Of Steven Yen
Sent: Monday, November 30, 2020 4:42 AM
To: Jim Lemon <drjimlemon at gmail.com>; r-help mailing list <r-help at
r-project.org>
Subject: Re: [R] Printing upon calling a function

Thanks. I know, my point was on why I get something printed by simply doing line
1 below and at other occasions had to do line 2.

me.probit(obj)

v<-me.probit(obj); v

On 2020/11/30 ?? 05:33, Jim Lemon wrote:
> Hi Steven,
> You seem to be assigning the result of me.oprobit(obj) to v instead of 
> printing it. By appending ";v" tp that command line, you
implicitly
> call "print".
>
> Jim
>
> On Mon, Nov 30, 2020 at 7:15 PM Steven Yen <styen at ntu.edu.tw>
wrote:
>> I hope I can get away without presenting a replicable set of codes 
>> because doing so would impose burdens.
>>
>> I call a function which return a data frame, with the final line
>>
>> return(out)
>>
>> In one case the data frame gets printed (similar to a regression 
>> printout), with simply a call
>>
>> me.probit(obj)
>>
>> In another case with a similar function, I could not get the results 
>> printed and the only way to print is to do the following:
>>
>> v<-me.oprobit(obj); v
>>
>> This is a puzzle, and I hope to find some clues. Thanks to all.
>>
>> My function looks like the following:
>>
>> me.oprobit0 <- function(obj,mean=FALSE,vb.method,jindex=NA,
>> resampling=FALSE,ndraws=100,mc.method=1,times100=TRUE,
>>                           Stata.mu=FALSE,testing=FALSE,digits=3){
>> ...
>> return(out) # out is a data frame
>> }
>>
>> ______________________________________________
>> R-help at 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.
______________________________________________
R-help at 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.


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