

   seq {base}                                   R Documentation

   SSeeqquueennccee GGeenneerraattiioonn

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

        Generate regular sequences.

   UUssaaggee::

        from:to
        seq(from, to)
        seq(from, to, by=)
        seq(from, to, length=)
        seq(along)

   DDeettaaiillss::

        The operator `:' and the first `seq(.)' form generate
        the sequence `from, from+1', ..., `to'.  `seq' is a
        generic function.

        The second form generates `from, from+by', ..., `to'.

        The third generates a sequence of `length' equally
        spaced values from `from' to `to'.

        The last generates the sequence `1, 2', ...,
        `length(along)'.

        If `from' and `to' are factors of the same length, the
        ``cross'' of the two is returned.

   VVaalluuee::

        The result is of `mode' `"integer"' if `from' is
        (numerically equal to an) integer.

   SSeeee AAllssoo::

        `rep', `sequence', `row', `col'.

   EExxaammpplleess::

        1:4
        pi:6 # float
        6:pi # integer

        seq(0,1, length=11)
        str(seq(rnorm(20)))
        seq(1,9, by = 2) # match
        seq(1,9, by = pi)# stay below
        seq(1,6, by = 3)
        seq(1.575, 5.125, by=0.05)

        for (x in list(NULL, letters[1:6], list(1,pi)))
          cat("x=",deparse(x),";  seq(along = x):",seq(along = x),"\n")

        f1 <- gl(2,3); f1
        f2 <- gl(3,2); f2
        f1:f2 # a factor, the ``cross''  f1 x f2

