Find a specific number of elements in a list or vector
satisfying a given condition
list.find(.data, cond, n = 1L)
A list or vector
A logical lambda expression
The number of items to find. (n = 1L by default)
n = 1L
A list or vector of at most n elements in .data
found to satisfy cond.
x <- list(p1 = list(type='A',score=list(c1=10,c2=8)),
p2 = list(type='B',score=list(c1=9,c2=9)),
p3 = list(type='B',score=list(c1=9,c2=7)))
list.find(x, type=='B', 1)
list.find(x, min(score$c1,score$c2) >= 9)
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