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Evaluate the number of set bits.

Description

Evaluate the number of set bits.

Usage

<Expr>$bitwise_count_ones()

Value

A polars expression

Examples

library("polars")

df <- pl$DataFrame(n = c(-1L, 0L, 2L, 1L))
df$with_columns(set_bits = pl$col("n")$bitwise_count_ones())

#> shape: (4, 2)
#> ┌─────┬──────────┐
#> │ n   ┆ set_bits │
#> │ --- ┆ ---      │
#> │ i32 ┆ u32      │
#> ╞═════╪══════════╡
#> │ -1  ┆ 32       │
#> │ 0   ┆ 0        │
#> │ 2   ┆ 1        │
#> │ 1   ┆ 1        │
#> └─────┴──────────┘