[help] How can I easlily create subtargets using map or tar_map?

[filipemsc]

Help

• I understand and agree to https://books.ropensci.org/targets/help.html.

Description

Suppose I have the following _targets.R file:

library(targets)
library(purrr)

tar_option_set()

subtars <- list(
  subtar1 = c("a", "b"),
  subtar2  = c("c", "d")
)

ff <- function(x,y){ paste(x,y)}

list(
  tar_target(
    name = main_tar,
    command = map(subtars, ~ ff(.x[[1]], .x[[2]])),
    cue = tar_cue(mode="always")
  )
)

This would be translated in this tar_visnetwork:

However, I would like to have something like this:

How can I achieve this without creating the subtars individually?

(This is because in my real world application I have almost 20 subtargets and it is very important to check how each one is running individually)

[wlandau]

To create that branching structure in the graph, you can use static branching. Please have a look at https://books.ropensci.org/targets/static.html. Example:

library(targets)
library(tarchetypes)

list(
  tar_target(
    name = main_target,
    command = "main_target"
  ),
  tar_map(
    tar_target(
      name = subtarget,
      command = paste(main_target, static_branch)
    ),
    values = list(static_branch = c("static_branch_1", "static_branch_2")),
    descriptions = NULL
  )
)

There is also dynamic branching, documented at https://books.ropensci.org/targets/dynamic.html

[filipemsc]

Thanks!