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mux_lookup_table [2011/07/31 18:50] hermann created |
mux_lookup_table [2026/08/28 03:27] (current) hermann Sync from local documentation review |
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| - | ====== Mux Lookup Table ====== | + | ====== Mux Lookup Table ====== |
| ===== Description ===== | ===== Description ===== | ||
| - | This functor makes a lookup table dynamic, feeding it back with a lookup table output from a model step. In the beginning of the first iteration, it reads the lookup table input from the initial port. | + | Initializes a loop variable and feeds it back with the lookup table produced by the previous step, letting a lookup table carry over from one iteration of a loop to the next. At the start of the first iteration, it reads its initial lookup table from Initial. The use of this functor is central to building dynamic models whose variables are updated from one step to the next through feedback. |
| ===== Inputs ===== | ===== Inputs ===== | ||
| - | ^ Name ^ Type ^ Description ^ | + | ^ Name ^ Type ^ Description ^ |
| - | | Initial | [[ Lookup Table Type|Lookup Table ]] | The initial lookup table. | | + | | Initial | [[Lookup Table Type]] | Initial lookup table, used on the first iteration. | |
| - | | Feedback | [[Lookup Table Type|Lookup Table ]] | Lookup table generated from model step. | | + | | Feedback | [[Lookup Table Type]] | Lookup table generated by the previous model step. This port must be connected to a functor placed later in the same loop, which supplies the lookup table produced by that iteration. | |
| ===== Optional Inputs ===== | ===== Optional Inputs ===== | ||
| + | |||
| + | None. | ||
| ===== Outputs ===== | ===== Outputs ===== | ||
| - | ^ Name ^ Type ^ Description ^ | + | ^ Name ^ Type ^ Description ^ |
| - | | Table | [[ Lookup Table Type|Lookup Table ]] | The output lookup table. | | + | | Table | [[Lookup Table Type]] | Lookup table for the current iteration: Initial on the first iteration, and the lookup table received through Feedback on every iteration after that. | |
| ===== Group ===== | ===== Group ===== | ||
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| [[Functor List#Control | Control]] | [[Functor List#Control | Control]] | ||
| - | ===== Notes ===== | + | ===== Notes ===== |
| + | |||
| + | This functor must always be placed directly inside a loop container, such as [[Repeat]], [[For]], or [[For Each Category]]. Placing it anywhere else reports a warning. | ||
| + | |||
| + | Feedback should be connected to a functor evaluated later in the same iteration, so that it can supply the lookup table produced by that step. Setting it to a fixed constant reports a warning, since a constant defeats the purpose of feeding a lookup table back from the previous step. | ||
| - | The use of this functor is critical for the development of dynamic models whose variables are dynamically updated as a result of the model feedback. | + | The connection made to the Feedback port is never treated as a dependency cycle: the model's dependency graph does not consider this functor dependent on whatever is connected to that port. |
| - | ===== Internal Name ===== | + | ===== Internal Name ===== |
| MuxLookupTable | MuxLookupTable | ||