| crossprod {base} | R Documentation |
Given matrices x and y as arguments,
crossprod returns their matrix cross-product.
This is formally equivalent to, but faster than, the
call t(x) %*% y.
crossprod(x, y=x)
crossprod(1:4) # = sum(1 + 2^2 + 3^2 + 4^2) drop(.Last.value) # scalarized