POSN-MATCH
[GENERIC-FUNCTION]
OM 6.1
Function Reference
| - list | a list | [default = (quote (10 20 30 40 50 60 70 80 90))] | |
| - positions | a list positions | [default = (quote ((0 1) 4 (6)))] | |
Description:
Constructs a new list by peeking elements in <list> at positions defined by <positions> (a list or tree of positions).
<positions> supports the syntax of 'expand-lst'.
Ex. (posn-match '(10 20 30 40 50 60 70 80 90) '((0 1) 4 (6))) => ((10 20) 40 (60))
Ex. (posn-match '(10 20 30 40 50 60 70 80 90) '(3*(0) 3_6)) => (10 10 10 40 50 60 70)