Allows you to specify extrapolation of the extreme Lookup pairs when the input is out of range of the Lookup. This also suppresses any out of range warning messages that might be generated.
Units: LOOKUP EXTRAPOLATE(units,dimensionless) --> units
Just as for normal Lookup usage the x argument is expected to be dimensionless. If not, a warning is issued, but not an error.
Example
LOOK((0,1),(1,1),(2,2))
LOOKUP EXTRAPOLATE(LOOK,-1) is equal to 1.0
LOOKUP EXTRAPOLATE(LOOK,1.5) is equal to 1.5
LOOKUP EXTRAPOLATE(LOOK,2.5) is equal to 2.5
Availability: Not PLE or PLE Plus.
See also: VECTOR LOOKUP, Lookups
Sample model: LOOKUP functions.mdl in FunctionExamples
