test for membership in a data structure, function, or module
member(x, s, 'p')
set, list, rtable, table, function, sum, product, or module
(optional) unevaluated name
The function member determines if x is a member of the set, list, Array, Matrix, Vector, table, function, or module s. It returns true if so, and false otherwise.
If s is a table, member tests whether x is a value in the table.
If a third argument 'p' is present and member yields true, the position of the first x in s is assigned to p in the case of sets, lists, and functions, while the member instance is assigned to the name p if s is a module. Position is determined as the index in the case of an rtable or module, and ith operand in the case of other data-structures.
The member command is thread safe as of Maple 15, provided that the name p, if used, is not shared between threads.
For more information on thread safety, see index/threadsafe.
m ≔ module_export⁡eend module:
The member command was updated in Maple 2023.
The s parameter was updated in Maple 2023.
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