[R] Make sure a data frame has been "fun through" a function

[stephen sefick]

Just as clarification, I don't want to hide anything from the user. I just
want to add something that I can test for in downstream function. I
appreciate all of the help.
kindest regards,

Stephen

On Mon, Feb 20, 2017 at 5:53 PM, Bert Gunter <bgunter.4567 at gmail.com> wrote:

> Yes.
>
> To elaborate a bit on Ista's reply:
>
> A)   The only way I can imagine hiding info from a user would be to
> encrypt it. This could be done programmatically I think, but I would have
> to research it to figure out how.
>
> B) If all you want to do is prevent the info from being printed, just
> create e.g  an S3 class of type "foo" that inherits from "data.frame" with
> your info as an attribute and provide a print.foo method that just prints
> the data frame without the attribute. Your function can access and use the
> attribute any way it likes.
>
> Cheers,
> Bert
>
>
> Bert
>
> On Feb 20, 2017 1:27 PM, "Ista Zahn" <istazahn at gmail.com> wrote:
>
> It depends on what you mean by 1). If you mean "won't annoy the user" then
> yes, e.g., add something to the class attribute. If 1) means "can't be
> discovered by the user" then no (at least not easily). Anything you can see
> they can see.
>
> Best,
> Ista
>
>
> On Feb 20, 2017 4:21 PM, "stephen sefick" <ssefick at gmail.com> wrote:
>
> Hello,
>
> I would like to add something to a data frame that is 1) invisible to the
> user, 2) has no side effects, and 3) I can test for in a following
> function. Is this possible? I am exploring classes and attributes and I
> have thought about using a list (but 1 and 2 not satisfied). Any help would
> be greatly appreciated.
>
> I did not provide a reproducible example because I see this as more of a R
> language question, but I will be happy to make a toy example if that would
> help.
>
> I appreciate all of the help.
>
> kindest regards,
>
> --
> Let's not spend our time and resources thinking about things that are so
> little or so large that all they really do for us is puff us up and make us
> feel like gods.  We are mammals, and have not exhausted the annoying little
> problems of being mammals.
>
>                                 -K. Mullis
>
> "A big computer, a complex algorithm and a long time does not equal
> science."
>
>                               -Robert Gentleman
>
>         [[alternative HTML version deleted]]
>
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>
> ______________________________________________
> 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/posti
> ng-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
>


-- 
Let's not spend our time and resources thinking about things that are so
little or so large that all they really do for us is puff us up and make us
feel like gods.  We are mammals, and have not exhausted the annoying little
problems of being mammals.

                                -K. Mullis

"A big computer, a complex algorithm and a long time does not equal
science."

                              -Robert Gentleman

	[[alternative HTML version deleted]]