[R] Extracting data using subset function

[Jeff Newmiller]

I will not (re-)define the basic terms used in describing how R is used... do read [1] for that.

[1] https://cran.r-project.org/doc/manuals/r-release/R-intro.html#Writing-your-own-functions, also via RShowDoc("R-intro"), in particular contrast section 1.5 vs section 10.

On February 5, 2023 12:10:46 PM PST, Upananda Pani <upananda.pani using gmail.com> wrote:
>Hi Jeff,
>
>Thanks for your reply. What do you exactly mean by "interactively"?  Would
>you please give me an example?
>Upananda
>
>On Mon, Feb 6, 2023 at 1:27 AM Jeff Newmiller <jdnewmil using dcn.davis.ca.us>
>wrote:
>
>> No, it means what it says: it is best used interactively rather than in
>> functions. That is not saying you cannot use it... merely that you should
>> probably use it interactively.
>>
>> The fact is, though, that integer indexing is much simpler and clearer for
>> your particular example than subset is.
>>
>> q <- p[1:20]
>> q2 <- subset( p, 1:100 <= 20) # 1:100 are positions
>>
>> On February 5, 2023 11:33:16 AM PST, Upananda Pani <
>> upananda.pani using gmail.com> wrote:
>> >Thank you. It means we can not use the subset function here.
>> >
>> >Regards
>> >
>> >On Mon, 6 Feb, 2023, 00:53 Andrés González Carmona, <andresgc using ugr.es>
>> wrote:
>> >
>> >> From ?subset:
>> >> Warning
>> >>
>> >> This is a convenience function intended for use interactively. For
>> >> programming it is better to use the standard subsetting functions like [
>> >> <http://127.0.0.1:21786/library/base/help/%5B>, and in particular the
>> >> non-standard evaluation of argument subset can have unanticipated
>> >> consequences.
>> >>
>> >> El 05/02/2023 a las 15:07, Upananda Pani escribió:
>> >>
>> >> Dear All,
>> >>
>> >> I want to create a vector p and extract first 20 observations using
>> subset
>> >> function based on logical condition.
>> >>
>> >> My code is below
>> >>
>> >> p <- 0:100
>> >>
>> >> I know i can extract the first 20 observations using the following
>> command.
>> >>
>> >> q <- p[1:20]
>> >>
>> >> But I want to extract the first 20 observations using subset function
>> which
>> >> requires a logical condition. I am not able to frame the logical
>> condition.
>> >>
>> >> The code should be
>> >>
>> >> q <- subset(p, logical condition)
>> >>
>> >> I am not able to do it. Please let me know what you think.
>> >>
>> >> Best regards,
>> >> Upananda
>> >>
>> >>      [[alternative HTML version deleted]]
>> >>
>> >> ______________________________________________R-help using r-project.org
>> mailing list -- To UNSUBSCRIBE and more, seehttps://
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>> >> PLEASE do read the posting guide
>> https://urldefense.com/v3/__http://www.R-project.org/posting-guide.html__;!!D9dNQwwGXtA!SLdwTGqSfhwUo4CfbUJFeL7hETw64hOG8MQ0FK_o5YdnvVHaOp9Qxs4D7d5e10hj3YQ8EuaFc8qbnkwuss43hA$
>> >> and provide commented, minimal, self-contained, reproducible code.
>> >>
>> >> --
>> >> * Andrés González Carmona *
>> >>
>> >
>> >       [[alternative HTML version deleted]]
>> >
>> >______________________________________________
>> >R-help using 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.
>>
>> --
>> Sent from my phone. Please excuse my brevity.
>>

-- 
Sent from my phone. Please excuse my brevity.