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

In rlist: A Toolbox for Non-Tabular Data Manipulation

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)

Example output

[1] 2
[1] 1

rlist documentation built on Sept. 5, 2021, 5:30 p.m.