Plot an extraction plan as a dependency graph

Renders the structure of an omop_plan as a small directed graph linking the cohort node to each output node. By default the graph is emitted as Graphviz DOT text (printed via cat) which can be piped to dot, pasted into any Graphviz viewer, or rendered with the DiagrammeR package. A base-graphics fallback (engine = "base") draws a simple cohort-to-outputs diagram using only base graphics, requiring no additional packages. This replaces the interactive plan DAG.

Usage

# S3 method for class 'omop_plan'
plot(x, engine = c("dot", "base"), ...)

Arguments

x

An omop_plan object.

engine

Character; "dot" (default) to emit Graphviz DOT text, or "base" to draw a base-graphics diagram.

...

Additional arguments (ignored).

Value

Invisibly: the DOT string when engine = "dot", otherwise x. Output is produced as a side effect.

Examples

if (FALSE) { # \dontrun{
plan <- ds.omop.plan()
plan <- ds.omop.plan.baseline(plan)
plot(plan)                 # Graphviz DOT text
plot(plan, engine = "base")
} # }