list.cases: Get all unique cases of a list field by expression

In rlist: A Toolbox for Non-Tabular Data Manipulation

Description

Get all unique cases of a list field by expression

Usage

list.cases(.data, expr, simplify = TRUE, sorted = TRUE)

Arguments

.data	A list or vector
expr	A lambda expression. The function will returns all cases of the elements if expr is missing.
simplify	logical. Should atomic vectors be simplified by unlist?
sorted	logical. Should the cases be sorted in ascending order?

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

foo <- list(x = LETTERS[1:3], y = LETTERS[3:5])
list.cases(foo)

Example output

[1] "A" "B"
[1] 8 9
[1] "A" "B" "C" "D" "E"

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