tcrossprod {Matrix} | R Documentation |
Take the cross-product of the transpose of a matrix.
This is formally equivalent to, but faster than, the
call x %*% t(x)
.
tcrossprod(x)
x |
a matrix-like object |
For some classes in the Matrix
package, such as the
cscMatrix-class
, it is much faster to calculate the
cross-product of the transpose directly instead of calculating the
transpose first and then its cross-product.
An object of an appropriate symmetric matrix class.