Editing Array slicing (section)

===1968: [[Algol 68]]===
Algol68 final report contains an early example of slicing, slices are specified in the form:

 [lower bound:upper bound] ''¢ for computers with extended character sets ¢''
or:
 (LOWER BOUND..UPPER BOUND) ''# FOR COMPUTERS WITH ONLY 6 BIT CHARACTERS. #''
Both bounds are inclusive and can be omitted, in which case they default to the declared array bounds. Neither the stride facility, nor diagonal slice aliases are part of the revised report.

Examples:

 [3, 3]real a := ((1, 1, 1), (2, 4, 8), (3, 9, 27)); ''# declaration of a variable matrix #''
 [,]  real c = ((1, 1, 1), (2, 4, 8), (3, 9, 27));   ''# constant matrix, the size is implied #''

 ref[]real row := a[2,];                    ''# alias/<u>ref</u> to a row slice #''
 ref[]real col2 = a[, 2];                   ''# permanent alias/<u>ref</u> to second column #''

 print ((a[:, 2], newline));                ''# second column slice #''
 print ((a[1⌈a, :], newline));              ''# last row slice #''
 print ((a[:, 2⌈a], newline));              ''# last column slice #''
 print ((a[:2, :2], newline));              ''# leading 2-by-2 submatrix "slice" #''

 +1.0000<sub>10</sub>+0 +4.0000<sub>10</sub>+0 +9.0000<sub>10</sub>+0
 +3.0000<sub>10</sub>+0 +9.0000<sub>10</sub>+0 +2.7000<sub>10</sub>+1
 +1.0000<sub>10</sub>+0 +8.0000<sub>10</sub>+0 +2.7000<sub>10</sub>+1
 +1.0000<sub>10</sub>+0 +1.0000<sub>10</sub>+0 +2.0000<sub>10</sub>+0 +4.0000<sub>10</sub>+0