Re: [R] NA and logical indexes

2008-11-28 Thread Berwin A Turlach
G'day Sebastian, On Fri, 28 Nov 2008 16:35:13 -0600 "Sebastian P. Luque" <[EMAIL PROTECTED]> wrote: > On Fri, 28 Nov 2008 22:01:15 - (GMT), > (Ted Harding) <[EMAIL PROTECTED]> wrote: > > > NA can seem to have a bewildering logic, but it all becomes clear if > > you interpret NA as "value unko

Re: [R] NA and logical indexes

2008-11-28 Thread Sebastian P. Luque
On Fri, 28 Nov 2008 22:01:15 - (GMT), (Ted Harding) <[EMAIL PROTECTED]> wrote: [...] > It is not! Oops, of course, I meant to say "return" rather than "set" :-/ [...] > NA can seem to have a bewildering logic, but it all becomes clear if > you interpret NA as "value unkown". > You asked

Re: [R] NA and logical indexes

2008-11-28 Thread Ted Harding
On 28-Nov-08 21:25:36, Sebastian P. Luque wrote: > Hi, > I vaguely remember this issue being discussed at some length in the > past, but am having trouble relocating the proper thread (defining an > adequate search string to do so): > > ---<---cut here---start--

[R] NA and logical indexes

2008-11-28 Thread Sebastian P. Luque
Hi, I vaguely remember this issue being discussed at some length in the past, but am having trouble relocating the proper thread (defining an adequate search string to do so): ---<---cut here---start-->--- R> foo <- data.frame(A=gl(2, 5, labels=letters[1:2]), X