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Subset an lg_df, preserving lineage attributes

Source: R/tag.R
sub-.lg_df.Rd

Subset an lg_df, preserving lineage attributes

Usage

# S3 method for class 'lg_df'
x[i, j, drop = FALSE]

Arguments

x

An lg_df object.

i

Row index, as in [.data.frame.

j

Column index, as in [.data.frame.

drop

Ignored : lg_df subsetting always behaves as though drop = FALSE. See Details.

Value

An lg_df with lineage attributes preserved (or a plain data.frame/vector for subsetting operations where preservation is not applicable, matching normal [.data.frame fallback behaviour).

Details

[.lg_df deliberately forces drop = FALSE, unlike base [.data.frame. This means single-column subsetting (e.g. df[, "col"]) returns a one-column lg_df/data.frame rather than a bare vector, so the lineage attributes are never silently lost through ordinary subsetting. Use df[[col]] or lg_id(df) when a plain vector is what you actually want.