[R] newbie question: ROW average

[Dimitris Rizopoulos]

look at ?rowMeans; you can also use "apply(mat, 1, mean)" but 
rowMeans() is better.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://www.med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "A Ezhil" <ezhil02 at yahoo.com>
To: "r-help" <r-help at stat.math.ethz.ch>
Sent: Monday, May 29, 2006 1:24 PM
Subject: [R] newbie question: ROW average


> Hi,
>
> I am new to R programming. I have a 992 x 74 matrix. I
> would like to form a new matrix by averging each 4
> rows
> from the original one. How can I use 'apply' instead
> of usual mean inside the nested for loop?
>
> Thanks in advance.
>
> regards,
> ezhil
>
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