Positions of origin locations in a spatial interaction model

Functions to get or set the positions of the origin locations in a spatial interaction model (or in a collection of spatial interaction models).

Usage

origin_positions(sim)

origin_positions(sim) <- value

Arguments

sim

a spatial interaction model object (an object of class sim) or a collection of spatial interaction models (an object of class sim_list)

value

a matrix with as many rows as the number of origin locations and 2 or 3 columns, or NULL

Value

for origin_positions, NULL or the coordinate matrix for the origin locations. For origin_positions<-, the modified sim object or sim_list object.

Positions

Location positions are given by numeric matrices with 2 or 3 columns. The first two columns are assumed to be geographical coordinates while the third column can be used, for instance, to store altitude. Coordinates are interpreted as is in graphical representations (see autoplot.sim()). They are not matched to the costs as those can be derived from complex movement models and other not purely geographical considerations.

See also

location_positions(), destination_positions(), origin_names()

Examples

positions <- as.matrix(french_cities[1:10, c("th_longitude", "th_latitude")])
distances <- french_cities_distances[1:10, 1:10] / 1000 ## convert to km
production <- rep(1, 10)
attractiveness <- rep(1, 10)
model <- static_blvim(distances, production, 1.5, 1 / 250, attractiveness)
origin_positions(model) <- positions
origin_positions(model)
#>    th_longitude th_latitude
#> 1        2.3525     48.8564
#> 2        5.3699     43.2966
#> 3        4.8350     45.7676
#> 4        1.4442     43.6046
#> 5        7.2715     43.6960
#> 6       -1.5543     47.2184
#> 7        3.8968     43.5985
#> 8        7.7520     48.5733
#> 9       -0.5794     44.8379
#> 10       3.0713     50.6305