from:to seq(from, to) seq(from, to, by=) seq(from, to, length=) seq(along)
: and the first seq(.) form above generate the sequence
from, from+1, ..., to.
seq is a generic function.
The second, 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.
mode "integer" if from is
(numerically equal to an) integer.rep, sequence, row, col.
1:4
pi:6 # float
6:pi # integer
seq(0,1, length=11)
seq(1,9, by = 2) # match
seq(1,9, by = pi)# stay below
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