Subset a LazyColumn

Subsets a LazyColumn object using standard R indexing rules: positive integers, negative integers, logical vectors (with recycling), character vectors (if named), zero, or missing (nothing).

Usage

# S4 method for class 'LazyColumn,ANY,ANY,ANY'
x[i, j, ..., drop = TRUE]

Arguments

x

A LazyColumn object.

i

Index: positive integers, negative integers, logical vector, character vector (if named), zero, or missing (nothing).

j

Not used for LazyColumn (1-dimensional). Must be missing.

...

Additional arguments (ignored).

drop

Logical. Currently ignored — single element extraction always returns a plain scaled numeric, consistent with vector subsetting.

Value

A LazyColumn when multiple elements are selected, or a scaled numeric value when a single element is selected.

Examples

set.seed(123)
mat_a <- matrix(rnorm(500), nrow = 50, ncol = 10)
lazy_a <- LazyMatrix(mat_a, "sd", "mean")
lazy_c <- lazy_a[, 2]

# Single element → plain scaled numeric
lazy_c[2]
#> [1] -0.193225

# Multiple elements → LazyColumn
lazy_c[c(1, 3, 5)]
#> An object of class "LazyColumn"
#> Slot "data":
#> [1]  0.25331851 -0.04287046 -0.22577099
#> 
#> Slot "scale":
#> [1] 0.2417669
#> 
#> Slot "location":
#> [1] -0.005107643
#>