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Scheme Procedure: vector? obj

Return true if obj is a vector, else return false.

Scheme Procedure: vector-empty? vec

Return true if vec is empty, i.e. its length is 0, else return false.

Scheme Procedure: vector= elt=? vec …

Return true if the vectors vec … have equal lengths and equal elements according to elt=?. elt=? is always applied to two arguments. Element comparison must be consistent with eq? in the following sense: if (eq? a b) returns true, then (elt=? a b) must also return true. The order in which comparisons are performed is unspecified.