[R] Printing upon calling a function

[Avi Gross]

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 using r-project.org> On Behalf Of Steven Yen
Sent: Monday, November 30, 2020 4:42 AM
To: Jim Lemon <drjimlemon using gmail.com>; r-help mailing list <r-help using 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 下午 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 using 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
>> }
>>
>> ______________________________________________
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>> 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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and provide commented, minimal, self-contained, reproducible code.


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