411 REFERENCE · Wikibooks
Scheme Programming/Vector Operations
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Creating Vectors
> (vector 1 2 3 4 5)
#(1 2 3 4 5)
> (define v (vector 1 2 3 4 5))
#<unspecified>
Vector Manipulation
Accessing Elements
> (vector-ref (vector 1 2 3 4 5) 3)
4
> (vector? (vector 1 2 3 4 5))
#t
Vector-ref takes two arguments, a vector and a valid index of the vector, and returns the element at that index.
Notice how the vector is zero indexed. I.e. the first element of a vector is referenced by number 0.
Modifying Elements
> (define my-vector (vector 1 2 3 4 5))
#<unspecified>
> (vector-set! my-vector 3 'a)
#<unspecified>
> my-vector
#(1 2 3 a 5)