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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