[R] Understanding which

[Ashim Kapoor]

Dear Jeff and Eric,

Okay and many thanks.
Best Regards,
Ashim

On Wed, Apr 18, 2018 at 4:56 PM, Jeff Newmiller <jdnewmil using dcn.davis.ca.us>
wrote:

> Look at
>
> which(x>100)
>
> This is a zero-length vector. The negative of nothing is nothing, not a
> list of all possible index values.
>
> Do you want
>
> x[ !( x > 100 ) ]
>
> ?
>
> On April 18, 2018 6:13:30 AM CDT, Ashim Kapoor <ashimkapoor using gmail.com>
> wrote:
> >Dear All,
> >
> >Here is a reprex:
> >
> >> x<- 1:100
> >> x[-which(x>100)]
> >integer(0)
> >
> >In words, I am finding out which indices correspond to values in x
> >which
> >are  greater than  100 ( there are no such items ) . Then I remove
> >those
> >indices. I should get back the x that I started with since there are no
> >items in x which are bigger than 100 . Instead, it is returning an
> >empty
> >vector.
> >
> >Why is this ? What am I misunderstanding?
> >
> >Best Regards,
> >Ashim
> >
> >       [[alternative HTML version deleted]]
> >
> >______________________________________________
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>
> --
> Sent from my phone. Please excuse my brevity.
>

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