rlist (version 0.4.2.3)

list.count: Count the number of elements that satisfy given condition

Description

Count the number of elements that satisfy given condition

Usage

list.count(.data, cond)

Arguments

.data

A list or vector

cond

A logical lambda expression for each element of .data to evaluate. If cond is missing then the total number of elements in .data will be returned.

Value

• An integer that indicates the number of elements with which cond is evaluated to be TRUE.

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.count(x, type=='B')
list.count(x, min(unlist(score)) >= 9)