[R] extraction - subsets

[Roberto Furlan]

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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