is.rectangle(w)
is.polygonal(w)
is.mask(w)
"owin"
.TRUE
if w
is a window
of the specified type.w
(object of class "owin"
) is
a rectangle (is.rectangle(w) = TRUE
),
a domain with polygonal boundary (is.polygonal(w) = TRUE
),
or
a binary pixel mask (is.mask(w) = TRUE
).owin