Re: [R] Specifying the ordering of a vector
Thank you very much! This worked. -- View this message in context: http://r.789695.n4.nabble.com/Specifying-the-ordering-of-a-vector-tp4542766p4542907.html Sent from the R help mailing list archive at Nabble.com. __ 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.
Re: [R] Specifying the ordering of a vector
On 09/04/2012 9:58 AM, crmnaw wrote: Hi, Thanks for your reply. In the example I gave in the original post, your code works. But for others, it doesn't and I'm not sure why it works for some cases and not for others. For example: x<-c(0.04,0.07,0.20,0.35,0.55,0.70) order(x) [1] 1 2 3 4 5 6 Let's say I want y to be in the order 1-2-5-3-6-4. So I do: y<-x[c(1,2,5,3,6,4)] y [1] 0.04 0.07 0.55 0.20 0.70 0.35 order(y) [1] 1 2 4 6 3 5 So, y isn't in the order I want it to be in. Any help that can be provided would be greatly appreciated. Okay, I didn't understand what you meant. You should think of the result of order(y) as a permutation to apply to y so that it is in sorted order. That is, y[order(y)] will always be in sorted order. So what you want is a permutation of x that will be put into sorted order by y[c(1,2,5,3,6,4)], i.e. you want the inverse of the permutation c(1,2,5,3,6,4). Turns out that if you apply order to a permutation you get its inverse. So what you want is y <- x[order(c(1,2,5,3,6,4))] Duncan Murdoch __ 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.
Re: [R] Specifying the ordering of a vector
Hi, Thanks for your reply. In the example I gave in the original post, your code works. But for others, it doesn't and I'm not sure why it works for some cases and not for others. For example: x<-c(0.04,0.07,0.20,0.35,0.55,0.70) order(x) [1] 1 2 3 4 5 6 Let's say I want y to be in the order 1-2-5-3-6-4. So I do: y<-x[c(1,2,5,3,6,4)] y [1] 0.04 0.07 0.55 0.20 0.70 0.35 order(y) [1] 1 2 4 6 3 5 So, y isn't in the order I want it to be in. Any help that can be provided would be greatly appreciated. -- View this message in context: http://r.789695.n4.nabble.com/Specifying-the-ordering-of-a-vector-tp4542766p4542815.html Sent from the R help mailing list archive at Nabble.com. __ 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.
Re: [R] Specifying the ordering of a vector
On 09/04/2012 9:38 AM, crmnaw wrote: Hi, I'm trying to create a vector (or matrix row) with a specific ordering. For example, I have the following vector: x<-c(0.1,0.2,0.3,0.4,0.5,0.6) that has order order(x) [1] 1 2 3 4 5 6 I want another vector that has the same values as x, but with a different ordering. For example, I want y to have values 0.1, 0.2, etc. but in the order 1-2-5-6-3-4. The answer would be y [1] 0.1 0.2 0.5 0.6 0.3 0.4 Any help would be greatly appreciated. Thanks. x[c(1,2,5,6,3,4)] will do it. Duncan Murdoch __ 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.
[R] Specifying the ordering of a vector
Hi, I'm trying to create a vector (or matrix row) with a specific ordering. For example, I have the following vector: x<-c(0.1,0.2,0.3,0.4,0.5,0.6) that has order order(x) [1] 1 2 3 4 5 6 I want another vector that has the same values as x, but with a different ordering. For example, I want y to have values 0.1, 0.2, etc. but in the order 1-2-5-6-3-4. The answer would be y [1] 0.1 0.2 0.5 0.6 0.3 0.4 Any help would be greatly appreciated. Thanks. -- View this message in context: http://r.789695.n4.nabble.com/Specifying-the-ordering-of-a-vector-tp4542766p4542766.html Sent from the R help mailing list archive at Nabble.com. __ 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.
