[R] check without loop

[jimi adams]

thanks to all,
%in%
was what i was looking for

----- Original Message -----
From: "Scott, Uriel" <uriel.scott at mirant.com>
To: "'jimi adams'" <imij at columbus.rr.com>; <r-help at stat.math.ethz.ch>
Sent: Wednesday, March 20, 2002 1:45 PM
Subject: RE: [R] check without loop


>
> I think the which() function would be helpful.  For example if x is a
vector
> and c some value then
>
> > which( x == c )
>
> will return a vector of those indices i of x for which x[i] = c.  Then you
> can test whether that vector
> has length 0.
>
> > -----Original Message-----
> > From: jimi adams [SMTP:imij at columbus.rr.com]
> > Sent: Wednesday, March 20, 2002 11:41 AM
> > To: r-help at stat.math.ethz.ch
> > Subject: [R] check without loop
> >
> > i am probably just missing this one, but how can i check to see if a
> > number
> > is a part of a vector?
> >
> > i know i could do a loop checking for equivalence for each element, but
i
> > am
> > thinking that there must be a simpler way to do it than that ( i think
> > that
> > i have even done it in the past, but can't remember how!)
> > thanks
> >
> > what i am working with:
> > (hope this makes sense)
> >
> > arclist
> >   [1]   2   2   6   7   8   9   9  11  11  11  12  13  14  15  16  17
19
> > 21
> >  [19]  22  23  24  25  25  29  29  30  32  34  35  35  38  39  40  40
41
> > 42
> >  [37]  43  44  45  46  47  48  49  50  51  52  53  54  57  58  59  60
61
> > 61
> >  [55]  61  61  61  61  61  61  61  61  61  61  61  61  61  61  61  61
61
> > 61
> >  [73]  61  61  61  61  61  61  61  61  61  61  62  65  67  68  68  69
71
> > 72
> >  [91]  75  76  77  79  81  82  83  84  84  85  86  87  88  90  91  92
93
> > 94
> > [109]  95  96  96  96  96 100
> >
> > # and am sampling from a different list
> > # if i draw, say 80, i would then not want to proceed, but if i draw a
> > number on arclist i do
> >
> >
> >
> > jimi adams
> > Department of Sociology
> > The Ohio State University
> > 300 Bricker Hall
> > 190 N Oval Mall
> > Columbus, OH 43210-1353
> > 614-688-4261
> >
> > our mind has a remarkable ability to think of contents as being
> > independent
> > of the act of thinking
> >                                             -georg simmel
> >
> >
>
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> > _._._
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