Dear Richard,
Thanks for the informative reply....
Yours sincerely,
AKSHAY M KULKARNI
________________________________
From: Richard O'Keefe <rao...@gmail.com>
Sent: Sunday, June 26, 2022 7:26 AM
To: akshay kulkarni <akshay...@hotmail.com>
Cc: Jeff Newmiller <jdnew...@dcn.davis.ca.us>; r-help@r-project.org
<r-help@r-project.org>
Subject: Re: [R] inconsistency in tryCatch...
I think the confusion is simple.
What you *really* wanted to do was
tryCatch(print("fred"), -- other stuff --)
because the first argument of tryCatch is an EXPRESSION. You don't need to
have 'function' in there anywhere at all. Every function in R gets to decide
for itself which, if any, of its arguments are evaluated, and when. NONE of
the arguments of tryCatch is evaluated until tryCatch decides it is time. In
most other programming languages, arguments are evaluated before the call, and
if you want something delayed, you have to wrap it in an anonymous function.
Not R.d
So tryCatch
- first sets up condition handling
- THEN evaluates its first argument
On Thu, 23 Jun 2022 at 07:42, akshay kulkarni
<akshay...@hotmail.com<mailto:akshay...@hotmail.com>> wrote:
Dear Jeff,
Thanks! I think it is an idiosyncrasy of tryCatch? The other
arguments like "error" doesn't need to be assigned to a call right? Just the
definition would be sufficient, i think?
Yours sincerely,
AKSHAY M KULKARNI
________________________________
From: Jeff Newmiller <jdnew...@dcn.davis.ca.us<mailto:jdnew...@dcn.davis.ca.us>>
Sent: Thursday, June 23, 2022 12:53 AM
To: r-help@r-project.org<mailto:r-help@r-project.org>
<r-help@r-project.org<mailto:r-help@r-project.org>>; akshay kulkarni
<akshay...@hotmail.com<mailto:akshay...@hotmail.com>>; R help Mailing list
<r-help@r-project.org<mailto:r-help@r-project.org>>
Subject: Re: [R] inconsistency in tryCatch...
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...@hotmail.com<mailto:akshay...@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]]
>
>______________________________________________
>R-help@r-project.org<mailto:R-help@r-project.org> mailing list -- To
>UNSUBSCRIBE and more, see
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--
Sent from my phone. Please excuse my brevity.
[[alternative HTML version deleted]]
______________________________________________
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