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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You are probably looking for %in% (e.g., 80 %in% arclist should be FALSE, 81 %in% arclist should be TRUE). --- jimi adams <imij at columbus.rr.com> wrote:> 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 > > >-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-> r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html > Send "info", "help", or "[un]subscribe" > (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch > _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._.___________________________________________________ -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
On Wed, Mar 20, 2002 at 11:40:58AM -0500, jimi adams wrote:> i am probably just missing this one, but how can i check to see if a number > is a part of a vector?...> # if i draw, say 80, i would then not want to proceed, but if i draw a > number on arclist i doif( !(80 %in% arclist)) {...} Getting a bit trickier, if you need to know which element it is, check out "which()". e.g. if you would only proceed if 79 was one of the first 20 elements if(any(which(arclist == 79) <=20)) {...} Cheers Jason -- Indigo Industrial Controls Ltd. 64-21-343-545 jasont at indigoindustrial.co.nz -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
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 > > > -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-. > -.-.- > r-help mailing list -- Read > http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html > Send "info", "help", or "[un]subscribe" > (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch > _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._. > _._._-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._