Extract Node List from Various Objects

Generic function to extract a node list (with attributes) from various object types including atomic vectors (unique values with frequencies), data frames, lists (recursive node decomposition), and tree models (randomForest, tree, rpart, xgb.Booster, gbm). The node list provides metadata about each node in the network.

Usage

nodelist(input_object, ...)

Arguments

input_object

An object containing node information (vector, data.frame, tree model, etc.)

...

Additional arguments passed to specific methods

Value

A data.frame where the first column is the node ID and subsequent columns contain node attributes

Examples

# Vector --- unique values with frequency counts
nodelist(c("A", "B", "A", "C"))
#>   name n
#> 1    A 2
#> 2    B 1
#> 3    C 1

# Node list with course as ID (column 2)
nodelist(courses, id_col = 2)
#>     course dept  prereq prereq2 crosslist credits level
#> 1  stat101 STAT math101    <NA>      <NA>       3   100
#> 2  stat102 STAT stat101    <NA>   math102       4   100
#> 3  stat202 STAT stat101    <NA>   data202       3   200
#> 4  math101 MATH    <NA>    <NA>      <NA>       3   100
#> 5  math102 MATH stat101    <NA>   stat102       4   100
#> 6  data202 DATA stat101    <NA>   stat202       3   200
#> 7    cs101   CS    <NA>    <NA>      <NA>       3   100
#> 8    cs201   CS   cs101    <NA>      <NA>       4   200
#> 9    cs301   CS   cs201 math201   math301       3   300
#> 10 math201 MATH math101    <NA>      <NA>       3   200
#> 11 math301 MATH   cs201 math201     cs301       4   300
#> 12 data301 DATA stat202   cs201   stat301       3   300
#> 13 stat301 STAT stat202   cs201   data301       4   300