pack: Compile Network Information into a Network Class
In enaR: Tools for Ecological Network Analysis

This function provides a flexible framework for importing flow network information into a network class object for analyses.

1 2	pack(flow, input = NA, respiration = NA, export = NA, output = NA, storage = NA, living = NA)

`flow`	The flow matrix.
`input`	The inputs into the system.
`respiration`	The quantities respired from the system.
`export`	The exports from the system.
`output`	The output (i.e. exports + respiration) from the system.
`storage`	The quantities stored in compartments within the system.
`living`	A logical vector indicating whether a node is either 'living' (= TRUE) or 'dead' (=FALSE).