Description Usage Arguments Details Examples
Create a transfun object representing a relative probability of
dispersal between patches. Typically used inside a call to
transition
1 2 3 4 5 | dispersal(value)
d(value)
is.dispersal(x)
|
value |
the (positive) exponential rate of decay of dispersal probabilities. Large values imply shorter range dispersal. |
x |
an object to be tested as a dispersal transfun object |
d()
is a shorthand for dispersal()
. The
transfun
object returned, when applied to a landscape
object,
produces a square symmetric matrix, with zero diagonal and off-diagonals
giving the relative between patch dispersal probability. This implies that
all individuals in the state will try to disperse. The
fraction remaining in the patch depends on value
. To have only some
fraction try to disperse, a dispersal transfun can be multiplied by a
probability transfun indicating the probability of attempting dispersal.
The relative dispersal probability is given by exp(-d * value)
,
where d
is the Euclidean distance between the origin and
destination patch.
1 2 3 4 5 | # these are equivalent
disp <- dispersal(3)
disp <- d(3)
is.dispersal(disp)
|
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