[R] how to merge 2 data frame if you want to exclude mutual obs

[arun]

Hi,
datA<-read.table(text="
Tdate            symbol        TA
12/12/12      AX              123
12/11/12      ZZ                A4R
12/12/12      WQ              B8R
",sep="",header=TRUE,stringsAsFactors=FALSE)
datB<- read.table(text="
Tdate            symbol        TA
12/12/12      AX              123
12/11/12      ZZ                A4R
",sep="",header=TRUE,stringsAsFactors=FALSE)
library(sqldf)
sqldf('SELECT * FROM datA  EXCEPT SELECT * FROM datB')
#     Tdate symbol  TA
#1 12/12/12     WQ B8R
#or
datA[!as.character(with(datA,interaction(Tdate,symbol,TA)))%in% as.character(with(datB,interaction(Tdate,symbol,TA))),]
#     Tdate symbol  TA
#3 12/12/12     WQ B8R
A.K.



----- Original Message -----
From: "Mossadegh, Ramine N." <Ramine.Mossadegh at finra.org>
To: arun <smartpink111 at yahoo.com>
Cc: 
Sent: Monday, May 13, 2013 4:17 PM
Subject: RE: [R] how to merge 2 data frame if you want to exclude mutual obs

Hi Arun,

I am trying to replicate sas code in R.  

So if in data frame A you have

Tdate            symbol        TA
12/12/12      AX               123
12/11/12      ZZ                A4R
12/12/12      WQ              B8R

Data frame B
Tdate            symbol        TA
12/12/12      AX               123
12/11/12      ZZ                A4R

I want to end up w/
Tdate            symbol        TA
12/12/12      WQ              B8R

All obs not in B

Thanks


-----Original Message-----
From: arun [mailto:smartpink111 at yahoo.com] 
Sent: Monday, May 13, 2013 4:13 PM
To: Mossadegh, Ramine N.
Subject: Re: [R] how to merge 2 data frame if you want to exclude mutual obs

HI,
Please provide a reproducible example and the output you expected.





----- Original Message -----
From: ramoss <ramine.mossadegh at finra.org>
To: r-help at r-project.org
Cc: 
Sent: Monday, May 13, 2013 3:22 PM
Subject: [R] how to merge 2 data frame if you want to exclude mutual obs

In the example below, I am merging 2 data frames & I want everything in the first one(all)
all2 <- merge(all,spets, by.x=c("tdate","symbol"),
by.y=c("tdate","symbol"),all.x=TRUE)

What if I want to exclude everything in y? I tried below but doesn't seem to work.
all2 <- merge(all,spets, by.x=c("tdate","symbol"),
by.y=c("tdate","symbol"),all.y=FALSE)

In SAS I  would do:

All2;
  merge all(in=a)
             spetz(in=b)
            ;
by tdate symbol;
if a and not b;
run;

How can I do this in R?
Thanks ahead for your help.



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