yes, you need to use the 'drop' argument; have a look at the help file
?"[" and then try this:
z <- matrix(rnorm(20), ncol = 5)
z[1, , drop = FALSE]
z[, 1, drop = FALSE]
I hope it helps.
Best,
Dimitris
Jim Nemesh wrote:
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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--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014
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and provide commented, minimal, self-contained, reproducible code.
