

   CCrreeaattee aa MMaattrriixx

        matrix(data = NA, nrow = 1, ncol = 1, byrow = FALSE, dimnames = NULL)
        as.matrix(x)
        is.matrix(x)

   DDeessccrriippttiioonn::

        `matrix' creates a matrix from the given set of values.
        `nrow' gives the desired number of rows and `ncol' the
        desired number of columns.  If either of `nrow' or
        `ncol' is not given, an attempt is made to infer it
        from the length of `data' and the other parameter.  If
        `byrow' is `FALSE' (the default) the matrix is filled
        by columns, otherwise the matrix is filled by rows.  A
        `dimnames' attribute for the matrix can be specified
        with the optional `dimnames' argument (which thus has
        to be a list of length 2).

        `as.matrix' attempts to turn its argument into a
        matrix.  This function is generic.

        `is.matrix' returns `TRUE' if `x' is a matrix (i.e., it
        has a `dim' attribute of length 2) and `FALSE' other-
        wise.

