merge_with_precedence: Merge two 'data.frame's, but where there are common fields...
In cmapR: CMap Tools in R

Description Usage Arguments Value See Also Examples

Merge two data.frames, but where there are common fields those in x are retained and those in y are dropped.

1	merge_with_precedence(x, y, by, allow.cartesian = TRUE, as_data_frame = TRUE)

`x`	the `data.frame` whose columns take precedence
`y`	another `data.frame`
`by`	a vector of column names to merge on
`allow.cartesian`	boolean indicating whether it's ok for repeated values in either table to merge with each other over and over again.
`as_data_frame`	boolean indicating whether to ensure the returned object is a `data.frame` instead of a `data.table`. This ensures compatibility with GCT object conventions, that is, the `rdesc` and `cdesc` slots must be strictly `data.frame` objects.

a data.frame or data.table object

data.table::merge

(x <- data.table::data.table(foo=letters[1:10], bar=1:10))
(y <- data.table::data.table(foo=letters[1:10], bar=11:20,
  baz=LETTERS[1:10]))
# the 'bar' column from y will be dropped on merge
cmapR:::merge_with_precedence(x, y, by="foo")