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Deprecated on 2019-05-16. Use drake_plan() transformations instead. See for the details.


  rules = NULL,
  wildcard = NULL,
  values = NULL,
  expand = TRUE,
  rename = expand,
  trace = FALSE,
  columns = "command",
  sep = "_"



Workflow plan data frame, similar to one produced by drake_plan().


Named list with wildcards as names and vectors of replacements as values. This is a way to evaluate multiple wildcards at once. When not NULL, rules overrules wildcard and values if not NULL.


Character scalar denoting a wildcard placeholder.


Vector of values to replace the wildcard in the drake instructions. Will be treated as a character vector. Must be the same length as plan$command if expand is TRUE.


If TRUE, create a new rows in the workflow plan data frame if multiple values are assigned to a single wildcard. If FALSE, each occurrence of the wildcard is replaced with the next entry in the values vector, and the values are recycled.


Logical, whether to rename the targets based on the values supplied for the wildcards (based on values or rules).


Logical, whether to add columns that trace the wildcard expansion process. These new columns indicate which targets were evaluated and with which wildcards.


Character vector of names of columns to look for and evaluate the wildcards.


Character scalar, separator for the names of the new targets generated. For example, in evaluate_plan(drake_plan(x = sqrt(y__)), list(y__ = 1:2), sep = "."), the names of the new targets are x.1 and x.2.


A workflow plan data frame with the wildcards evaluated.


The commands in workflow plan data frames can have wildcard symbols that can stand for datasets, parameters, function arguments, etc. These wildcards can be evaluated over a set of possible values using evaluate_plan().

Specify a single wildcard with the wildcard and values arguments. In each command, the text in wildcard will be replaced by each value in values in turn. Specify multiple wildcards with the rules argument, which overrules wildcard and values if not NULL. Here, rules should be a list with wildcards as names and vectors of possible values as list elements.

See also