rlist (version 0.2.2)

list.group: Group a list by the value of an expression evaluated for each member.

Description

Group a list by the value of an expression evaluated for each member.

Usage

list.group(.data, key, ...)

Arguments

.data

list

key

A lambda expression for the group key

...

Additional parameters passed to unique

Examples

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.group(x,type)
list.group(x,mean(unlist(score)))