Kernel functions

Kernel functions

Usage

kernelfunction(
  d,
  bw,
  kernel = c("uniform", "quartic", "triweight", "epanechnikov")
)

Arguments

d

Distance

bw

Bandwidth of a kernel

kernel

Kernel type. One of "uniform", "quartic", "triweight", and "epanechnikov"

Value

numeric. Kernel weights.

References

https://github.com/JanCaha/SpatialKDE

See also

Other Macros for calculation: extract_at(), summarize_aw(), summarize_sedc()

Examples

v_dist <- c(1, 10, 100, 25, 50, 0.1)
bw_dist1 <- 1
bw_dist2 <- 10
kernelfunction(v_dist, bw_dist1, "uniform")
#> [1] 0.5 0.0 0.0 0.0 0.0 0.5
kernelfunction(v_dist, bw_dist1, "quartic")
#> [1] 0.0000000 0.0000000 0.0000000 0.0000000 0.0000000 0.9188437
kernelfunction(v_dist, bw_dist1, "triweight")
#> [1] 0.000 0.000 0.000 0.000 0.000 0.999
kernelfunction(v_dist, bw_dist1, "epanechnikov")
#> [1] 0.0000 0.0000 0.0000 0.0000 0.0000 0.7425
kernelfunction(v_dist, bw_dist2, "uniform")
#> [1] 0.5 0.5 0.0 0.0 0.0 0.5
kernelfunction(v_dist, bw_dist2, "quartic")
#> [1] 0.9188437 0.0000000 0.0000000 0.0000000 0.0000000 0.9373125
kernelfunction(v_dist, bw_dist2, "triweight")
#> [1] 0.999000 0.000000 0.000000 0.000000 0.000000 0.999999
kernelfunction(v_dist, bw_dist2, "epanechnikov")
#> [1] 0.742500 0.000000 0.000000 0.000000 0.000000 0.749925