Maps

Exodus distinguishes between several kinds of integer "maps" used to track the correspondence between local and global numbering. Exodus.jl represents these with lightweight marker types:

abstract type AbstractExodusMap <: AbstractExodusType end

struct NodeMap    <: AbstractExodusMap end
struct ElementMap <: AbstractExodusMap end
struct FaceMap    <: AbstractExodusMap end
struct EdgeMap    <: AbstractExodusMap end

These types are used purely for dispatch — they carry no data themselves; the actual map values are plain Vectors of the database's map integer type M.

The element map

elem_map = read_map(exo)   # Vector{M} of length num_elements(exo.init)

ID maps

ID maps relate local node/element numbers to "global" application IDs and are commonly used in parallel/decomposed meshes.

node_id_map = read_id_map(exo, NodeMap)
elem_id_map = read_id_map(exo, ElementMap)

write_id_map(exo, NodeMap, node_id_map)
write_id_map(exo, ElementMap, elem_id_map)

write_id_map asserts that the length of map matches the expected number of nodes or elements for the chosen map type.