How to retrieve value form dataframe by Key?

Date: Thu, 24 May 2012 01:09:58 -0700 (PDT)
From: Manish Gupta<mandecent.gupta at gmail.com>
To:r-help at r-project.org
Subject: [R] How to retrieve value form dataframe by Key?
Message-ID:<1337846998835-4631173.post at n4.nabble.com>
Content-Type: text/plain; charset=us-ascii

Hi,

I have one datagrame

Col1      Col2        Col3
Col3
xxx         er            This is third record of 1st line.
This is 4th record of first line.
xxy         er            This is third record of 1st line.
This is 4th record of second line
xyx         er            This is third record of 1st line.
This is 4th record of third line

I want to get records corresponding to key (here Col1). How can i implement
it?

e.g.
if i key in xxx i should get
xxx         er            This is third record of 1st line.
This is 4th record of first line.

if i key in xxy i should get
xxy         er            This is third record of 1st line.
This is 4th record of second line

Regards


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