Skip to content
Back to formatted view

Raw Message

Message-ID: <FDC2577E-47DD-4717-8080-F013F6538321@comcast.net>
Date: 2012-08-18T05:55:08Z
From: David Winsemius
Subject: Row means of matrix.
In-Reply-To: <CAAuJZX+y_XFdmRQ4V7ZVigw8NP=K8vNQN6zMxTf8eMLpispmpw@mail.gmail.com>

On Aug 17, 2012, at 8:28 PM, Yingwei Lee wrote:

> m=matrix(c(1:4, c(0, 0, 0, 0), c(1, 0, 1, 1)), nc=4, byrow=TRUE)

is.na(m) <- m==0
rowMeans(m, na.rm=T)
#[1] 2.5 NaN 1.0

-- 
David Winsemius, MD
Alameda, CA, USA