R: Count the number of elements that satisfy given condition

list.count {rlist} | R Documentation

## 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)

[Package rlist version 0.4.6.1 Index]