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WITH LOOKUP(x,(l#)) auxiliary WITH LOOKUP of the y value corresponding to x in the xy pairs l# |
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Specifies a nonlinear relationship between the input x and the output by passing the input through a series of x,y pairs specified as numbers. It is the same as L(x) where L is defined by the equation L(L#).
Restrictions:Must appear first on the right hand side of the equation and can not be followed by anything else.
The WITH LOOKUP function is a convenient way to specify a nonlinear relationship without explicitly naming the Lookup function to be used. This can reduce clutter and be somewhat quicker than naming a separate Lookup variable but is not as flexible.
| Units: | WITH LOOKUP(dmnl,#) --> 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. The output units are those for the left hand side variable.
Example
X=WITH LOOKUP(1.5,((0,1),(1,1),(2,2)) is equal to 1.5.
See also: VECTOR LOOKUP, LOOKUP AREA et seq., Lookups
Sample model: WITH LOOKUP.mdl in FunctionExamples
