list.mapv: Map each member of a list by an expression to a vector.

In rlist: A Toolbox for Non-Tabular Data Manipulation

Description

Map each member of a list by an expression to a vector.

Usage

list.mapv(.data, expr, as, use.names = TRUE)

Arguments

.data	a list or vector
expr	a lambda expression
as	the mode to corece. Missing to unlist the mapped results.
use.names	Should the names of the results be preserved?

Value

A vector in which each element is mapped by expr in .data

See Also

list.map

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.mapv(x, type)
list.mapv(x, min(score$c1,score$c2))

Example output

 p1  p2  p3 
"A" "B" "B" 
p1 p2 p3 
 8  9  7 

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