Odp: RES: Recode numbers

"Filipe Leme Botelho" <filipe.botelho at vpar.com.br> 
Odeslal: r-help-bounces at r-project.org

RES: [R] Recode numbers

I think this is proper.

a <- c(1, 2, 3, 3, 4, 4, 5, 6, 1, 2, 2, 3, 1, 2, 1, 2, 3, 3, 4, 5, 1, 2,
3, 4)
b <- c(1, 5, 8, 9, 14, 20, 3, 10, 12, 6, 16, 7, 11, 13, 17, 18, 2, 4,
15, 19)

ref <- 1
for (i in 2:length(a)) {
   if (a[i]!=a[i-1]) ref <- c(ref, ref[length(ref)]+1)
   if (a[i]==a[i-1]) ref <- c(ref, ref[length(ref)])
   }

a2 <-b[ref]
a1 <- c(1, 5, 8, 8, 9, 9, 14, 20, 3, 10, 10, 12, 6, 16, 7, 11, 13, 13,
17, 18, 2, 4, 15, 19)

a1==a2


-----Mensagem original-----
De: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Em nome de Duncan Murdoch
Enviada em: quarta-feira, 1 de junho de 2011 15:51
Para: Lisa
Cc: r-help at r-project.org
Assunto: Re: [R] Recode numbers

(The attributions are a little messed up here:)

I have two sets of numbers that look like

a<- c(1, 2, 3, 3, 4, 4, 5, 6, 1, 2, 2, 3, 1, 2, 1, 2, 3, 3, 4, 5, 1,

2, 3,

4)

b<- c(1, 5, 8, 9, 14, 20, 3, 10, 12, 6, 16, 7, 11, 13, 17, 18, 2, 4,

15,

19)

I just want to use "b" to encode "a" so that "a" looks like

a1<- c(1, 5, 8, 8, 9, 9, 14, 20, 3, 10, 10, 12, 6, 16, 7, 11, 13,

13, 17,

18, 2, 4, 15, 19)

Does anyone have a suggestion how to deal with this? Thank you in

advance.

is a1 = b[a] what you are looking for?

HTH

Pete

Thank you for your help, Pete. I tried b[a], but it is not a1.

I think you'll need to explain the rule used for a1[9], a1[10], etc.

Duncan Murdoch

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