arc operations {bnlearn} | R Documentation |
Drop, add or set the direction of an arc.
set.arc(x, from, to, check.cycles = TRUE, debug = FALSE) drop.arc(x, from, to, debug = FALSE) reverse.arc(x, from, to, check.cycles = TRUE, debug = FALSE)
x |
an object of class bn . |
from |
a character string, the label of a node. |
to |
a character string, the label of another node. |
check.cycles |
a boolean value. If TRUE the graph is
tested for acyclicity; otherwise the graph is returned anyway. |
debug |
a boolean value. If TRUE a lot of debugging output
is printed; otherwise the function is completely silent. |
The set.arc
function operates in the following way:
from
and to
,
the arc from
-> to
is added.
from
and
to
, its direction is set to from
- to
.
to
-> from
is present, it's reversed.
from
-> to
is present, no action is taken.
The drop.arc
function operates in the following way:
from
and to
,
no action is taken.
from
and
to
, it's dropped.
from
and
to
, it's dropped regardless of its direction.
The reverse.arc
function operates in the following way:
from
and to
,
it returns an error.
from
and
to
, it returns an error.
to
-> from
is present, it's reversed.
from
-> to
is present, it's reversed.
set.arc
and drop.arc
return invisibly an updated
copy of x
.
Marco Scutari
data(learning.test) res = gs(learning.test) ## use debug = TRUE for more information ## Not run: set.arc(res, "A", "B", debug = TRUE) drop.arc(res, "A", "B", debug = TRUE) reverse.arc(res, "A", "D", debug = TRUE) ## End(Not run)