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Showing content from http://www.lispworks.com/documentation/HyperSpec/Body/f_svref.htm below:

CLHS: Accessor SVREF

Syntax:

svref simple-vector index => element

(setf (svref simple-vector index) new-element)

Arguments and Values:

simple-vector---a simple vector.

index---a valid array index for the simple-vector.

element, new-element---an object (whose type is a subtype of the array element type of the simple-vector).

Description:

Accesses the element of simple-vector specified by index.

Examples:

 (simple-vector-p (setq v (vector 1 2 'sirens))) =>  true
 (svref v 0) =>  1
 (svref v 2) =>  SIRENS
 (setf (svref v 1) 'newcomer) =>  NEWCOMER               
 v =>  #(1 NEWCOMER SIRENS)

Side Effects: None.

Affected By: None.

Exceptional Situations: None.

See Also:

aref, sbit, schar, vector, Section 3.2.1 (Compiler Terminology)

Notes:

svref is identical to aref except that it requires its first argument to be a simple vector.

 (svref v i) ==  (aref (the simple-vector v) i)

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