| list.which | R Documentation | 
Give the indices of list elements satisfying a given condition
list.which(.data, cond)
.data | 
 A   | 
cond | 
 A logical lambda expression  | 
an integer vector
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.which(x, type == 'B')
list.which(x, min(score$c1,score$c2) >= 8)
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