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setMethod("crossprod", signature(x = "CsparseMatrix", y = "missing"),
      function(x, y = NULL)
      .Call("Csparse_crossprod", x, trans = FALSE, triplet = FALSE,
        PACKAGE = "Matrix"))

setMethod("t", signature(x = "CsparseMatrix"),
      function(x)
      .Call("Csparse_transpose", x, PACKAGE = "Matrix"))

setMethod("tcrossprod", signature(x = "CsparseMatrix"),
      function(x)
      .Call("Csparse_crossprod", x, trans = TRUE, triplet = FALSE,
        PACKAGE = "Matrix"))