Calculates composition imbalance index (also known as the m index) -- a sum of cell’s values over the entire site divided by the number of cell in the site. m has a range from -1 (site completely dominated by the -1 values) to 1 (site completely dominated by the 1 values).
composition_index(x)SpatRaster or matrix containing two values: -1 and 1
A numeric vector
data(r_start, package = "spatialising")
composition_index(r_start)
#> [1] 0.9
ts1 = kinetic_ising(r_start, B = -0.3, J = 0.7)
composition_index(ts1)
#> [1] 0.8792
ts2 = kinetic_ising(r_start, B = -0.3, J = 0.7, updates = 2)
composition_index(ts2)
#> [1] 0.8872 0.8848
# \donttest{
library(terra)
#> terra 1.7.55
r1 = rast(system.file("raster/r_start.tif", package = "spatialising"))
composition_index(r1)
#> [1] 0.9
r2 = kinetic_ising(r1, B = -0.3, J = 0.7)
composition_index(r2)
#> [1] 0.8968
# }