public class ExponentialVariogram extends java.lang.Object implements Variogram
v(r) = c + b * (1 - e-3r/a)
where a is the range parameter and b is sill paramter. The distance of two
pairs increase, the variogram of those two pairs also increase. Eventually,
the increase of the distance can not cause the variogram increase. The
distance which cause the variogram reach plateau is called range. The sill
parameter b is the maximum variogram value (by default, we set c = 0).
The parameter c is the so-called nugget effect. Though the value of the variogram for h = 0 is strictly 0, several factors, such as sampling error and short scale variability, may cause sample values separated by extremely small distances to be quite dissimilar. This causes a discontinuity at the origin of the variogram. The vertical jump from the value of 0 at the origin to the value of the variogram at extremely small separation distances is called the nugget effect.
| Constructor and Description |
|---|
ExponentialVariogram(double a,
double b)
Constructor.
|
ExponentialVariogram(double a,
double b,
double c)
Constructor.
|
| Modifier and Type | Method and Description |
|---|---|
double |
f(double r) |
java.lang.String |
toString() |
public ExponentialVariogram(double a,
double b)
a - the range parameter.b - the sill parameter.public ExponentialVariogram(double a,
double b,
double c)
a - the range parameter.b - the sill parameter.c - the nugget effect parameter.