Colon {base} | R Documentation |
Generate regular sequences.
from:to a:b
from |
starting value of sequence. |
to |
(maximal) end value of the sequence. |
a, b |
factor s of same length. |
The binary operator :
has two meanings: for factors a:b
is
equivalent to interaction(a, b)
(except for labelling by
la:lb
not la.lb
).
For numeric arguments from:to
is equivalent to seq(from, to)
,
and generates a sequence from from
to to
in steps of 1
or 1-
. Value to
will be included if it differs from
from
by an integer up to a numeric fuzz of about 1e-7
.
For numeric arguments, a numeric vector. This will be of type
integer
if from
and to
are both integers
and representable in the integer type, otherwise of type
numeric
.
For factors, a factor.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
seq
.
As an alternative to using :
for factors, interaction
.
For :
used in the formal representation of an interaction, see
formula
.
1:4 pi:6 # real 6:pi # integer f1 <- gl(2,3); f1 f2 <- gl(3,2); f2 f1:f2 # a factor, the "cross" f1 x f2