r - Matrix multiplication giving NA -


i'm attempting simple matrix multiplication, has never given me issue before.

i have x matrix (nxfe) , matrix of observations, y (nx1). purposes of example lets 

x <- matrix(c(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1), nrow=4) y <- matrix(c(1, 2, 3, 4), nrow=4)

simple code multiplication 

xt <- t(x) xy <- xt%*%y

however, when this, matrix of na's (nx1).

this has never happened before. have checked , there appropriate values in matrices. appreciated.


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