Span

Span

is the head of span ranges like 1;;3.

Examples

>> ;; // FullForm
Span(1, All)

>> 1;;4;;2 // FullForm
Span(1, 4, 2)

>> 2;;-2 // FullForm
Span(2, -2)

>> ;;3 // FullForm
Span(1, 3)