[R] Matching pairs from two data frame

[Bill.Venables at csiro.au]

Try ?merge

> d1 <- read.table(textConnection("
       x    y     a
    1  30   40    0.2
    2  21   130  0.3
    "))
> d2 <- read.table(textConnection("
       x    y     b
    1  30   40    1
    2  40   30    3
    3  20   40    7
    4  11    30   2
    5  130  250  15
    6  21    130  17
    "))
> merge(d1, d2)
   x   y   a  b
1 21 130 0.3 17
2 30  40 0.2  1 


Bill Venables
CSIRO Laboratories
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mailto:Bill.Venables at csiro.au
http://www.cmis.csiro.au/bill.venables/ 

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of solea
Sent: Tuesday, 8 April 2008 12:20 AM
To: r-help at r-project.org
Subject: [R] Matching pairs from two data frame


I am looking for a solution to match 2 dataframes from pairs of values
(x and
y) as indicated thereafter :

First dataframe : 
DATA1
     x    y     a
1  30   40    0.2
2  21   130  0.3

Second dataframe
DATA2
     x    y     b
1  30   40    1
2  40   30    3
3  20   40    7
4  11    30   2
5  130  250  15
6  21    130  17

expected Results :

DATA3
    x    y      a      b
1  30  40    0.2    1
2  21  130   0.3   17

Many thanks in advance fo your help

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