extract_network: Extract network
In alaindanet/SizeTrophicInteractions: What the Package Does (One Line, Title Case)

Extract local network from a list of species and size

extract_network(
  data,
  species,
  var,
  metaweb,
  classes = NULL,
  link = "flux",
  out_format = "adjacency"
)

`data`	a data.frame containing species and size variable.
`species`	species variable name in the dataset.
`var`	variable characterizing the size.
`metaweb`	an object created by the build_metaweb function.
`classes`	data.frame created by the compute_classes function.