[R] inconsistency in tryCatch...

[Jeff Newmiller]

I would type

  tryCatch

at the R console and start reading code. It looks like it uses some internals, though.

On June 22, 2022 12:43:55 PM PDT, "Ebert,Timothy Aaron" <tebert using ufl.edu> wrote:
>I am used to seeing a function like this:
>> function_name <- function(arg_1, arg_2, ...) {
>Function body
>}
>
>Where would I find documentation on building functions of the form of tryCatch?
>In the form I am used to, the function would look like this:
>
>tryCatch <- function(){
>  print("fred")
>}
>tryCatch()
>
>
>
>Tim
>
>-----Original Message-----
>From: R-help <r-help-bounces using r-project.org> On Behalf Of Jeff Newmiller
>Sent: Wednesday, June 22, 2022 3:24 PM
>To: r-help using r-project.org; akshay kulkarni <akshay_e4 using hotmail.com>; R help Mailing list <r-help using r-project.org>
>Subject: Re: [R] inconsistency in tryCatch...
>
>[External Email]
>
>You defined a function. You did not call the function. tryCatch returned the object you defined. So the interactive console printed the object returned.
>
>Invoking the "function" function does not call the defined function for you. Try:
>
>tryCatch((function() print("fred"))(), error = function(e) sum(1:3), finally = sum(1:3))
>
>On June 22, 2022 12:00:38 PM PDT, akshay kulkarni <akshay_e4 using hotmail.com> wrote:
>>Dear members,
>>                          I have the following code:
>>
>>        > tryCatch(function() print("fred"),  error = function(e) sum(1:3), finally = sum(1:3))
>>         function() print("fred")
>>
>>The expected output from the tryCatch call should be to print "fred" to the console, and exit, but as seen above, it is outputting
>>          function() print("fred")
>>
>>Can you people please shed some light on what is happening?
>>
>>thanking you,
>>Yours sincerely,
>>AKSHAY M KULKARNI
>>
>>       [[alternative HTML version deleted]]
>>
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>and provide commented, minimal, self-contained, reproducible code.

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