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Range: Difference between revisions
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:''This page is about the dyadic primitive function. "Range" refers to [[Unique]] in K and [[Index Generator]] in BQN.'' | :''This page is about the dyadic primitive function. "Range" refers to [[Unique]] in K and [[Index Generator]] in BQN.'' | ||
{{Built-ins|Range|…|..}} or '''Sequence''' is a [[dyadic]] [[primitive function]] which creates a [[vector]] of consecutive integers based on the start and end values given by its [[argument|arguments]]. It serves as an [[index origin]]-agnostic alternative to [[Index Generator]] for creating a range of numbers. Range is currently implemented in [[NARS2000]] (using the digraph < | {{Built-ins|Range|…|..}} or '''Sequence''' is a [[dyadic]] [[primitive function]] which creates a [[vector]] of consecutive integers based on the start and end values given by its [[argument|arguments]]. It serves as an [[index origin]]-agnostic alternative to [[Index Generator]] for creating a range of numbers. Range is currently implemented in [[NARS2000]] (using the digraph <syntaxhighlight lang=apl inline>..</source>), [[Extended Dyalog APL]], and [[dzaima/APL]]. | ||
== Basic usage == | == Basic usage == | ||
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If both arguments are [[scalar]] integers, Range creates the consecutive range between the two arguments inclusive. If the left argument is greater than the right argument, the result becomes a decreasing sequence. | If both arguments are [[scalar]] integers, Range creates the consecutive range between the two arguments inclusive. If the left argument is greater than the right argument, the result becomes a decreasing sequence. | ||
< | <syntaxhighlight lang=apl> | ||
3…8 | 3…8 | ||
3 4 5 6 7 8 | 3 4 5 6 7 8 | ||
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</source>{{Works in|[[NARS2000]], [[Extended Dyalog APL]], [[dzaima/APL]]}} | </source>{{Works in|[[NARS2000]], [[Extended Dyalog APL]], [[dzaima/APL]]}} | ||
It should be noted that, since the exact definition of Range has never been standardised, a different implementation might as well choose to return < | It should be noted that, since the exact definition of Range has never been standardised, a different implementation might as well choose to return <syntaxhighlight lang=apl inline>⍬</source> or even throw a [[DOMAIN ERROR]] for <syntaxhighlight lang=apl inline>X…Y</source> when <syntaxhighlight lang=apl inline>X>Y</source>. | ||
== Extensions == | == Extensions == | ||
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[[NARS2000]] supports step size and multi-dimensional range (giving the result similar to multi-dimensional [[Index Generator]]): | [[NARS2000]] supports step size and multi-dimensional range (giving the result similar to multi-dimensional [[Index Generator]]): | ||
< | <syntaxhighlight lang=apl> | ||
3 2..10 ⍝ Start, step, and end values | 3 2..10 ⍝ Start, step, and end values | ||
3 5 7 9 | 3 5 7 9 | ||
| Line 47: | Line 47: | ||
In [[Extended Dyalog APL]], the extension is focused on making it easier to produce integer or character vector constants: | In [[Extended Dyalog APL]], the extension is focused on making it easier to produce integer or character vector constants: | ||
< | <syntaxhighlight lang=apl> | ||
1…10 20…100 80…0 | 1…10 20…100 80…0 | ||
1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100 80 60 40 20 0 | 1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100 80 60 40 20 0 | ||