Message-ID: <50978D9F.6010202@sunrise.ch>
Date: 2012-11-05T09:57:51Z
From: Christian Schulz
Subject: division giving spurious NA
Hi,
I stumbled acros the following disturbing computation:
x <- matrix(c(
2.594028,0.8468867,NA,2.244600,1.215535,0.8233032,NA,3.176697,3.425393,2.5345225,NA,3.247219),nrow=3,byrow=TRUE)
x # having NA in column3 only
x[1:2,]/x[3,]
## [,1] [,2] [,3] [,4]
[1,] 0.7572935 NA NA NA
[2,] 0.4795913 0.253541 NA 0.9782823
where do the two Nas in columns 2 and 4 come from?
TIA
Christian
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Christian W. Hoffmann,
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