a vector of distances to compute the variogram for.
range
the range value for the exponential,
spherical and gaussian variograms or the exponent value for the power
variogram.
slope
the slope for the variogram, only appropriate for
linear.vgram
and
power.vgram.
OPTIONAL ARGUMENTS:
sill
the sill value for the variogram, only applies to the exponential,
spherical and gaussian models.
This is the absolute sill, it is the maximum value of the variogram
minus any nugget effect.
nugget
the nugget effect.
VALUE:
a vector of variogram values at the supplied distances.