Hi,
this should work fine:
subset <- c(2,3)
for (n in subset) {
cat(n,":",matrixX[as.integer(vectorY[row(vectorY)==n]),])
}
Good luck
Bart
Original message:
From: Roberto Furlan <roberto.furlan_at_gmail.com>
Date: Sun 19 Mar 2006 - 04:47:47 EST
Hi everybody,
let us assume i have the following matrixX and vectorY
matrixX <- runif(100)
dim(matrixX) <- c(10,10)
vectorY <- as.matrix(as.character(seq(1,10)))
if I define:
subsample<-c("2")
i can extract the rows from matriX based on the elements in vectorY which are
listed in subsample
matrixX[vectorY==subsample]
if I define subsample with more than 1 element, such as: subsample=c("2", "3")
how can i extract the rows from matriX based on the elements in vectorY which
are listed in subsample?
many thanks
Roberto Furlan
University of Turin
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