Path: news.mathworks.com!not-for-mail
From: <HIDDEN>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Is there any non loop implement to find the index of a vector  in the matrix?
Date: Sun, 14 Dec 2008 13:49:02 +0000 (UTC)
Organization: -
Lines: 19
Message-ID: <gi32se$79s$1@fred.mathworks.com>
References: <gi31mu$sqn$1@fred.mathworks.com>
Reply-To: <HIDDEN>
NNTP-Posting-Host: webapp-03-blr.mathworks.com
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 8bit
X-Trace: fred.mathworks.com 1229262542 7484 172.30.248.38 (14 Dec 2008 13:49:02 GMT)
X-Complaints-To: news@mathworks.com
NNTP-Posting-Date: Sun, 14 Dec 2008 13:49:02 +0000 (UTC)
X-Newsreader: MATLAB Central Newsreader 1155829
Xref: news.mathworks.com comp.soft-sys.matlab:506865


How about this:

a=[1 2];
b=[4 5;6 7;8 7;1 2;2 3];
%return the row index where theres the number you are searching for
firstcolumnrow=find(b(:,1)==a(1,1))
secondcolumnrow=find(b(:,2)==a(1,2))

if firstcolumnrow and seconcolumnrow are equal this is the row that you are searching for

"zedong 
" <zdongwu@gmail.com> wrote in message <gi31mu$sqn$1@fred.mathworks.com>...
> Is there any non loop implement to find the index of a vector  in the matrix?
> for example:
> a=[1 2]
> b=[4 5;6 7;8 7;1 2;2 3]
> I want to return  4
> (which is the index of a in b)
> Thank you !