Creates a matrix with directions (i.e., azimuth) to central cell, of specified size k. The matrix can be used as weight matrix when calculating the convergence index (see Examples).
w_azimuth(k)Neighborhood size around focal cell. Must be an odd number. For example, k=3 implies a 3*3 neighborhood.
A matrix where each cell value is the azimuth from that cell towards the matrix center.
m = w_azimuth(3)
m
#> [,1] [,2] [,3]
#> [1,] 135 180 225
#> [2,] 90 0 270
#> [3,] 45 0 315
m = w_azimuth(5)
m
#> [,1] [,2] [,3] [,4] [,5]
#> [1,] 135.00000 153.43495 180 206.5650 225.0000
#> [2,] 116.56505 135.00000 180 225.0000 243.4350
#> [3,] 90.00000 90.00000 0 270.0000 270.0000
#> [4,] 63.43495 45.00000 0 315.0000 296.5651
#> [5,] 45.00000 26.56505 0 333.4349 315.0000