Capture unevaluated mapping expressions

Captures R expressions to be evaluated later against GRanges data. Each expression may be a bare column name (resolved against mcols(data)), one of the genomic specials (start, end, width, mid), or an arbitrary R expression (e.g. log2(score + 1), (start + end) / 2).

Usage

map(...)

Arguments

...

Named expressions (e.g. x = start, y = log2(score + 1)).

Value

A SeqMap object: a named list of unevaluated language objects.

Details

Evaluation is deferred until prep() time inside each element, where .resolve_mapping() is called.

Examples

m <- map(x = start, y = score)