Editing Array slicing (section)

===1964: [[PL/I]]===
PL/I provides two facilities for array slicing.
* Using ''iSub DEFINING'', an array slice can be declared using ''iSUB'' variables to map specific elements in a "base array" onto elements of the "defined array". iSUBs can define rows, columns, diagonals, or many-to-one mappings.<ref name=PLI>{{cite book |last1=IBM Corporation |title=PL/I for MVS & VM Language Reference |date=1995}}</ref>{{rp|pp.212–213}} The following example defines <code>Y</code> as a one-dimensional slice consisting of the diagonal elements of the two-dimensional array <code>X</code>. 
 DECLARE X(5,5);
 DECLARE Y(5) DEFINED(X(1SUB,1SUB));

A reference to <code>Y(2)</code> is a reference to <code>X(2,2)</code>, and so on.
* A slice, called a ''cross-section'', of an array can be referred to by using asterisk as the subscript for one or more dimensions. The following code sets all the elements in the first column of <code>X</code> to zero. One or more subscripts can be specified by asterisks in an expression.<ref name=PLI />{{rp|p.43}} 
 DECLARE X(5,5);
 X(*,1)=0;