Let's say that I have the following plan:
test_plan = drake_plan(
foo = target(x + 1, transform = map(x = c(5, 10))),
bar = 42
)
Now I want to create a new target that contains the two subtargets foo_5, foo_10 and the target bar. How can I do this? I feel it must be super simple but I don't manage to get a solution.
Thanks!
Yes, it is both possible and simple. The built-in solution is to use tags: https://books.ropensci.org/drake/static.html#tags. Example:
library(drake)
drake_plan(
foo = target(
x + 1,
transform = map(x = c(5, 10), .tag_out = group)
),
bar = target(
42,
# You need a transform to use a tag, even for 1 target.
transform = map(tmp = 1, .tag_out = group)
),
baz_map = target(group, transform = map(group)),
baz_combine = target(c(group), transform = combine(group))
)
#> # A tibble: 7 x 2
#> target command
#> <chr> <expr>
#> 1 foo_5 5 + 1
#> 2 foo_10 10 + 1
#> 3 bar_1 42
#> 4 baz_map_foo_5 foo_5
#> 5 baz_map_foo_10 foo_10
#> 6 baz_map_bar_1 bar_1
#> 7 baz_combine c(foo_5, foo_10, bar_1)
Created on 2019-11-16 by the reprex package (v0.3.0)