How can I reorder the rows of a matrix, data.frame or vector according to another one

Question

test1 <- as.matrix(c(1, 2, 3, 4, 5))
row.names(test1) <- c(\"a\", \"d\", \"c\", \"b\", \"e\") 

test2 <- as.matrix(c(6, 7, 8, 9, 10))
row.names(test2) <- c(\         


        

Answer 1

test2 <- test2[rownames(test1),,drop=FALSE]