The indices and entries functions return sequences of the indices (or keys) and the entries respectively of the table or Array t corresponding to the entries that are explicitly stored.

The result returned is a sequence of lists in an apparently arbitrary order which cannot be controlled by the user. However, there is a one-to-one correspondence between the result of indices and entries.

If the 'nolist' option is used the result returned will be a simple sequence without lists.  This is useful for tables where every index or entry is a single object.  When 'nolist' is used on a table with expression sequence indices or entries, the pairings may be difficult to deduce in the result.

If the 'pairs' option is used the result returned will be a sequence of index = entry pairs.  Since the equation form can represent sequences in either the index or entry part of the equation, neither each side nor the whole equation is wrapped in a list.

The pairs option was introduced in Maple 15.

For more information on Maple 15 changes, see Updates in Maple 15.

The indices and entries commands are thread-safe as of Maple 15.

For more information on thread safety, see index/threadsafe.