Is there any way to force a slice of a matrix to stay a matrix? R tends to convert a single row of a matrix into a vector.

Example:

z<-matrix (rnorm(20), ncol=5)
zz<-z[1,]
is.matrix(zz) #FALSE

I usually resort to:

zz<-matrix(z[1,], ncol=dim(z)[2], dimnames=list(rownames(z)[1], colnames(z)))

But that seems horribly kludgy.

Thanks!

-Jim

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