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MAP
Synopsis
Do a procedure on each element of a list, recursively
Description
The MAP command EVALuates a specified program (or a variable which contains one) to a list of objects or values. If one of the objects is a list, MAP will apply the program recursively to the items in the inner list.
Compatibility
MAP is fully equivalent to its userRPL counterpart.
Usage
Input
4:
3:
2: { 1 2 { X Y } }
1: « 2 * »
…………………………………………………………………………………………………………
MAP
Output
4:
3:
2:
1: { 2 4 { 'X*2' 'Y*2' } }
…………………………………………………………………………………………………………
Related Commands
| Command | Short Description | |
|---|---|---|
| →LIST | Assemble a list from its elements | |
| LIST→ | Split a list into its elements | |
| DOLIST | Do a procedure with elements of lists | CHANGED |
| DOSUBS | Do a procedure on a subset of a list | CHANGED |
| MAP | Do a procedure on each element of a list, recursively | |
| MAPLIST→ | Do a procedure on each element recursively, return individual elements | NEW |
| STREAM | Do a procedure on consecutive elements of a list | |
| ΔLIST | First differences on the elements of a list | |
| ΣLIST | Sum of all elements in a list | CHANGED |
| ΠLIST | Product of all elements in a list | CHANGED |
| ADD | Concatenate lists and/or elements | CHANGED |
| SORT | Sort elements in a list | |
| REVLIST | Reverse the order of elements in a list | |
| ADDROT | Add elements to a list, keep only the last N elements | NEW |
| SEQ | Assemble a list from results of sequential procedure |