[R] Extracting data using subset function

[粕谷英一]

Do you mean something like the following?  Here the first elements are
selected by subset function.

> x1
[1] 9 8 7 6 5 4 3
> z1
[1]  TRUE  TRUE  TRUE FALSE FALSE FALSE FALSE FALSE FALSE
> subset(x1,z1)
[1] 9 8 7

2023年2月6日(月) 3:34 Upananda Pani <upananda.pani using gmail.com>:
>
> No i am teaching Econometrics and learning R. I am not a student.
>
> Thank you
> Upananda
>
> On Sun, 5 Feb, 2023, 19:51 Chris Ryan via R-help, <r-help using r-project.org>
> wrote:
>
> > Is this a homework problem?
> >
> > --Chris Ryan
> > --
> > Sent from my Android device with K-9 Mail. Please excuse my brevity.
> >
> > On February 5, 2023 9:07:03 AM EST, Upananda Pani <upananda.pani using gmail.com>
> > wrote:
> > >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, see
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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.
> >
> > ______________________________________________
> > 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.
> >
>
>         [[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.