Brings a geometric mean function (prod(x)^(1/length(x))
Details
Geometric mean is possibly a better alternative than a bare prod when calculating
composite maps from monoscale maps.
Examples
x <- c(1, 2, 3, 4, 6)
mean(x) # arithmetic mean
#> [1] 3.2
gmean(x) # geometric mean
#> [1] 2.70192
