As Per Interp
Subtype of Extrap MethodThe reference quantity is extrapolated in accordance with the rules of an assumed interpolation method.
The latter method should be specified in the given context as an element of the list Interp Method or an object of type Interpolation
Formally, given a) a set of independent variable values x₁, x₂, ..., xₙ in increasing order, for which the respective reference quantity values v₁, v₂, ..., vₙ are known and b) a given interpolation method, then the value v corresponding to some x lying outside the range spanned by x₁, x₂, ..., xₙ is given by applying the rules of the given interpolation method.