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I-Beam was introduced in [[APL\360]] as an [[ambivalent function]] for implementers to execute [[wikipedia:IBM System/360|IBM System/360]] (''I-Beam'' being pronounced very similarly to ''IBM'') instructions from program control. The convenience of this lead to I-Beam becoming directly available for use by anyone.<ref>[https://dl.acm.org/doi/pdf/10.1145/585923.585925 The Design of APL]</ref> However, modern IBM-derived APLs replace all I-Beams with [[quad name]]s. For example, <syntaxhighlight lang=apl inline>5⌶</syntaxhighlight> became <syntaxhighlight lang=apl inline>⎕DL</syntaxhighlight> ([[Delay]]) while changing time unit from [[wikipedia:jiffy|jiffies]] of 1⁄300<sup>th</sup> of a second to a whole second. | I-Beam was introduced in [[APL\360]] as an [[ambivalent function]] for implementers to execute [[wikipedia:IBM System/360|IBM System/360]] (''I-Beam'' being pronounced very similarly to ''IBM'') instructions from program control. The convenience of this lead to I-Beam becoming directly available for use by anyone.<ref>[https://dl.acm.org/doi/pdf/10.1145/585923.585925 The Design of APL]</ref> However, modern IBM-derived APLs replace all I-Beams with [[quad name]]s. For example, <syntaxhighlight lang=apl inline>5⌶</syntaxhighlight> became <syntaxhighlight lang=apl inline>⎕DL</syntaxhighlight> ([[Delay]]) while changing time unit from [[wikipedia:jiffy|jiffies]] of 1⁄300<sup>th</sup> of a second to a whole second. | ||
Later, after it became common to use arrays as operands, [[Dyalog APL]] began using the [[glyph]] as an operator where the operand selects functionality. It is used for testing experimental features, some of which may eventually become primitives or quad | Later, after it became common to use arrays as operands, [[Dyalog APL 12.1]] began using the [[glyph]] as an operator where the operand selects functionality. It is used for testing experimental features, some of which may eventually become primitives or quad names. For example, <syntaxhighlight lang=apl inline>819⌶</syntaxhighlight> became <syntaxhighlight lang=apl inline>⎕C</syntaxhighlight> ([[Case Convert]]), while introducing distinction between case folding (for case insensitive comparisons) and case mapping (for human presentation forms). | ||
== Mnemonics == | == Mnemonics == | ||
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== External links == | |||
* [https://help.dyalog.com/latest/#Language/Primitive%20Operators/I%20Beam.htm Dyalog documentation] | |||
== References == | == References == | ||
<references/> | <references/> | ||
{{APL built-ins}}[[Category:Primitive operators]] | {{APL built-ins}}[[Category:Primitive operators]] | ||