Dear Erin,
-0.50 is greater than -1.00, this means that your logical test returns
all FALSE answers. Now consider the results of:
x[FALSE]
you are selecting none of 'x', hence numeric(0).
Perhaps you mean:
x[x <= -0.50 & x >= -1.0]
HTH,
Josh
On Sat, Aug 28, 2010 at 7:47 PM, Erin Hodgess <erinm.hodgess at gmail.com>
wrote:> Dear R People:
>
> I just produced the following:
>
> ?x <- seq(-3,3,.01)
> ?x[x>= -0.50 & x<= -1.0]
> numeric(0)
> ?x[x>= -0.50 && x<= -1.0]
> numeric(0)
>
> What am I doing wrong, please? ?This seems strange.
>
> Thanks,
> Erin
>
>
> --
> Erin Hodgess
> Associate Professor
> Department of Computer and Mathematical Sciences
> University of Houston - Downtown
> mailto: erinm.hodgess at gmail.com
>
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>
--
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/