[R] replace data by a rule

[arun]

Hi,

library(car)
set.seed(25)
 x1<- data.frame(id=sample(1:8,8,replace=FALSE),f1=LETTERS[1:8])
 x1$id<-recode(x1$id,'5=1;6=2;7=3;8=4')
x1
#  id f1
#1  4  A
#2  1  B
#3  1  C
#4  3  D
#5  2  E
#6  3  F
#7  2  G
#8  4  H

A.K.

----- Original Message -----
From: Hui Du <Hui.Du at dataventures.com>
To: "r-help at r-project.org" <r-help at r-project.org>
Cc: 
Sent: Monday, May 6, 2013 5:29 PM
Subject: [R] replace data by a rule

Hi All,

I have data set like
x = data.frame(id = 1:8, f1 = LETTERS[1:8])

I want to replace id 5, 6, 7, 8 by 1, 2, 3, 4 respectively. e.g the map is

ID-1

ID-2

5

1

6

2

7

3

8

4



I have lots of data and rules. How to do it in a few lines rather than do them one by one like:

x[x$id == 5,]$id = 1
x[x$id == 6,]$id = 2

etc.

Thanks.

HXD




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