Return a marginal matrix from a BirdFlowR model

Marginals in BirdFlow models are stored such that the cell [i, j] represents the probability of the bird being in state i in the prior timestep and state j in the next. Thus the number of rows in the marginal equals the number of cells within the dynamic mask for the prior timestep and the columns count is equal to the included cells for the following timestep.

Usage

get_marginal(x, marginal = NULL, from = NULL)

Arguments

x

A BirdFlow object

marginal

A marginal code, e.g. "M_01-02"

from

The first timestep associated with the marginal. Note marginals are always forward so the second marginal will be from + 1 or 1 (when from is the last timestep).

Value

A marginal matrix

See also

lookup_transitions() will generate a list of the transitions needed to predict or route between two points in time. get_transition() will return a transition matrix - often calculated on the fly from a marginal.