last.updated: Number of rows affected by last update

In Rdatatable/data.table: Extension of `data.frame`

Number of rows affected by last update

Description

Returns number of rows affected by last := or set().

Usage

    .Last.updated

Details

Be aware that in the case of duplicate indices, multiple updates occur (duplicates are overwritten); .Last.updated will include all of the updates performed, including duplicated ones. See examples.

Value

Integer.

See Also

:=

Examples

d = data.table(a=1:4, b=2:5)
d[2:3, z:=5L]
.Last.updated

# updated count takes duplicates into account #2837
DT = data.table(a = 1L)
DT[c(1L, 1L), a := 2:3]
.Last.updated

Rdatatable/data.table documentation built on Dec. 21, 2024, 3:08 a.m.