Number Value

This hook functor identifies a value by assigning a number to it, so that a container built to consume numbered values — most commonly one of the calculator functors, such as Calculate Map — can pick it out by that number. It performs no computation itself: the enclosing container inspects its Value and Value Number ports and registers the value under that number, making it available as vN inside the container's expression.

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Map Algebra Supplementary

Number Value only stores the value and the number under which it should be registered. The container it is placed inside inspects those ports and performs the actual registration.

This functor must be placed directly inside one of the containers that consume numbered values — Calculate Map, Calculate Categorical Map, Calculate Lookup Table Values, Calculate Value, Create String, Calculate R Expression, Calculate Python Expression, or Calculate Lookup Table Keys And Values. Placing it inside any other functor is not supported and will fail validation.

Once registered, the value is available inside the container's expression as vN (for example, Value Number = 1 gives v1). This applies to the verbose syntax only. The separate abbreviated syntax eliminates hook functors like Number Value entirely, referencing each connected input directly by its port name instead — see Calculator functor shorthand.

Value Number is normally set to a fixed constant chosen by the model author; connecting it to another functor's output instead reports a warning, since the identifier is meant to stay fixed and readable.

Once Value Number is set, this functor's banner in the model diagram shows “#N”; once the value itself is known, it reads “Value #N is X” (for example, “Value #1 is 42”), making the variable easy to identify in the diagram.

NumberValue

Connecting data inputs in the Calculate Map documentation — shows Number Value exposing a scalar as v1.