Matrix Crossproduct
Compute the matrix cross-product of a sparse and a dense or sparse matrix.
tcrossprod_simple_triplet_matrix(x, y = NULL) ## crossprod_simple_triplet_matrix(x, y = NULL) matprod_simple_triplet_matrix(x, y)
x, y |
a matrix in |
Function tcrossprod_simple_triplet_matrix implements fast computation
of x %*% t(x) and x %*% t(y) (tcrossprod). The
remaining functions are (optimized) wrappers.
A double matrix, with appropriate dimnames taken from x
and y.
The computation is delegated to tcrossprod if y (or x
if y == NULL) contains any of the special values NA,
NaN, or Inf.
Christian Buchta
crossprod for dense-on-dense computations.
## x <- matrix(c(1, 0, 0, 2, 1, 0), nrow = 3) x s <- as.simple_triplet_matrix(x) tcrossprod_simple_triplet_matrix(s, x) ## tcrossprod_simple_triplet_matrix(s) ## tcrossprod_simple_triplet_matrix(s[1L, ], s[2:3, ])
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.