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Terminology: Difference between revisions
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APL terminology can be confusing, especially as it often differs from common conventions in [[wikipedia:computer science]], including distinguishing between terms that are usually considered synonyms. | APL terminology can be confusing, especially as it often differs from common conventions in [[wikipedia:computer science|computer science]], including distinguishing between terms that are usually considered synonyms. | ||
== Basic terms == | == Basic terms == | ||
{| class=wikitable | {| class=wikitable | ||
! Term !! Explanation !! | ! Term !! Explanation !! Other names used in Computer Science | ||
|- | |- | ||
| [[Argument]] || an [[array]] that a [[function]] is applied to || | | [[Argument]] || an [[array]] that a [[function]] is applied to || [[wikipedia:Operand|Operand]], [[wikipedia:Parameter (computer programming)|Parameter]] | ||
|- | |- | ||
| [[Array]] || a collection of [[element]]s arranged along '''zero''' or more [[axes]] (note that a [[scalar]] is also an array) || [[wikipedia:Tensor#As_multidimensional_arrays|Tensor]], [[wikipedia:Array_data_structure#Multidimensional_arrays|Multi-dimensional array data structure]], [[wikipedia:Array_data_type#Multi-dimensional_arrays|Multi-dimensional array data type]] but note that [[wikipedia:Scalar (mathematics)|Scalar]] [[wikipedia:Variable (computer science)|Variable]]s are not generally regarded as arrays | | [[Array]] || a collection of [[element]]s arranged along '''zero''' or more [[axes]] (note that a [[scalar]] is also an array) || [[wikipedia:Tensor#As_multidimensional_arrays|Tensor]], [[wikipedia:Array_data_structure#Multidimensional_arrays|Multi-dimensional array data structure]], [[wikipedia:Array_data_type#Multi-dimensional_arrays|Multi-dimensional array data type]] but note that [[wikipedia:Scalar (mathematics)|Scalar]] [[wikipedia:Variable (computer science)|Variable]]s are not generally regarded as arrays | ||
|- | |- | ||
| [[Cell]] || a [[subarray]] which is formed by selecting a single [[index]] along | | [[Cell]] || a [[subarray]] which is formed by selecting a single [[index]] along zero or more leading [[axes]] and the whole of each trailing axis || [[wikipedia:Array slicing|Array slice]] | ||
|- | |- | ||
| [[Function]] || a program that is applied to one or two [[array]] [[argument]]s to produce an array result || [[wikipedia:Subroutine|Subroutine]], [[wikipedia:Computer program|Program]] | | [[Function]] || a program that is applied to one or two [[array]] [[argument]]s to produce an array result || [[wikipedia:Subroutine|Subroutine]], [[wikipedia:Computer program|Program]] | ||
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| [[Major cell]] || a [[cell]] of an [[array]] which has [[rank]] one smaller than the rank of the array, or equal to it if the array is a [[scalar]] || Element | | [[Major cell]] || a [[cell]] of an [[array]] which has [[rank]] one smaller than the rank of the array, or equal to it if the array is a [[scalar]] || Element | ||
|- | |- | ||
| [[Matrix]] || an [[array]] of [[rank]] 2 || Table | | [[Matrix]] || an [[array]] of [[rank]] 2 || 2D array, Table | ||
|- | |- | ||
| [[Nested array]] || an [[array]] that contains at least one [[element]] which is not a [[simple scalar]] || [[wikipedia:Data structure|Data structure]] | | [[Nested array]] || an [[array]] that contains at least one [[element]] which is not a [[simple scalar]] || [[wikipedia:Data structure|Data structure]] | ||
| Line 22: | Line 22: | ||
| [[Operand]] || an [[array]] or [[function]] that is passed to an [[operator]] || Argument, [[wikipedia:Parameter (computer programming)|Parameter]] | | [[Operand]] || an [[array]] or [[function]] that is passed to an [[operator]] || Argument, [[wikipedia:Parameter (computer programming)|Parameter]] | ||
|- | |- | ||
| [[Operator]] || a higher-order function that | | [[Operator]] || a higher-order function that [[derived function|derives a function]] based on one or two [[operands]] || [[wikipedia:Higher-order function|Higher-order function]] | ||
|- | |- | ||
| [[Primitive]] || a built-in [[function]] or [[operator]] | | [[Primitive]] || a built-in [[function]] or [[operator]] represented by a [[glyph]] || [[wikipedia:Language primitive|Language primitive]], [[wikipedia:Operator (computer programming)|Operator]] | ||
|- | |- | ||
| [[Rank]] || the number of dimensions or [[axes]] in the structure of an [[array]] || Order | | [[Rank]] || the number of dimensions or [[axes]] in the structure of an [[array]] (the rank is the [[Tally|length]] of the [[shape]]) || Degree, Dimensionality, Order | ||
|- | |- | ||
| [[Scalar]] || an [[array]] of [[rank]] 0 || Value | | [[Scalar]] || an [[array]] of [[rank]] 0 || Value | ||
|- | |- | ||
| [[Shape]] || a [[vector]] of lengths of an [[array]] along each of its [[axes]] || Array dimensions | | [[Shape]] || a [[vector]] of the lengths of an [[array]] along each of its [[axes]] (the shape of a [[scalar]] is an [[zilde|empty vector]]) || Array dimensions | ||
|- | |- | ||
| [[Simple scalar]] || a [[number]], [[character]], or (in dialects that support such) [[Namespace]] || [[wikipedia:Primitive data type|Primitive data type]], [[wikipedia:Value (computer science)|Value]] | | [[Simple scalar]] || a [[number]], [[character]], or (in dialects that support such) [[Namespace]] || [[wikipedia:Primitive data type|Primitive data type]], [[wikipedia:Value (computer science)|Value]] | ||
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| [[Vector]] || an [[array]] of [[rank]] 1 || Array, [[wikipedia:List (abstract data type)|List]] | | [[Vector]] || an [[array]] of [[rank]] 1 || Array, [[wikipedia:List (abstract data type)|List]] | ||
|} | |} | ||
== See also == | |||
* [[German terminology]] | |||
* [[Chinese terminology]] | |||
{{APL development}}[[Category:Lists]] | {{APL development}}[[Category:Lists]] | ||