All good points.

-- Bert

On Mon, Sep 3, 2012 at 12:07 PM, Greg Snow <538280@gmail.com> wrote:

> I would be very surprised if the x value from locator matched the x
> value in the data to the precision needed by ==, and what if 2 points
> have the same x-value but different y-values, you would need to also
> check the y's.  With appropriate rounding this would work, but would
> just be reinventing the identify function (as Peter pointed out).
>
> So if you are happy to reinvent wheels for learning purposes then
> locator, which, and rounding (or min)  could teach a lot.  If the
> simplest most straight forward solution is sought, then use identify
> instead of locator.
>
> On Fri, Aug 31, 2012 at 5:03 PM, Bert Gunter <gunter.berton@gene.com>
> wrote:
> > ?which ##
> > as in ix <- which(x==values)
> >
> > -- Bert
> >
> > On Fri, Aug 31, 2012 at 2:09 PM, Michael <comtech.usa@gmail.com> wrote:
> >
> >> Hi all,
> >>
> >> I am using "locator" to select the points from a scatter plot...
> >>
> >> This is all fine.
> >>
> >> But the problem is that the locator only returns the axis values of the
> >> selected points.
> >>
> >> Instead, I would like to get the index of these select points...
> >>
> >> The axis values are real-values so it's a bit hard for me to directly
> >> reverse-engineer the index nubmers..
> >>
> >> How to do that?
> >>
> >> Thank you!
> >>
> >>         [[alternative HTML version deleted]]
> >>
> >> ______________________________________________
> >> R-help@r-project.org mailing list
> >> 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.
> >>
> >
> >
> >
> > --
> >
> > Bert Gunter
> > Genentech Nonclinical Biostatistics
> >
> > Internal Contact Info:
> > Phone: 467-7374
> > Website:
> >
> http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
> >
> >         [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > 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.
>
>
>
> --
> Gregory (Greg) L. Snow Ph.D.
> 538280@gmail.com
>



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm

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