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== Contributions to APL and J == | == Contributions to APL and J == | ||
McDonnell suggested the symbol < | McDonnell suggested the symbol <syntaxhighlight lang=apl inline>×</syntaxhighlight> for [[Signum]] and designed the [[Circle function]] (<syntaxhighlight lang=apl inline>○</syntaxhighlight>) as a way to unify trigonometric and hyperbolic functions<ref>McDonnell, Eugene. [https://www.jsoftware.com/papers/eem/storyofo.htm "The Story of ○"].</ref>. He designed APL's [[complex Floor]]<ref>McDonnell, Eugene. [https://www.jsoftware.com/papers/eem/complexfloor.htm "Complex Floor"].</ref> and suggested the extension of [[Or]] (<syntaxhighlight lang=apl inline>∨</syntaxhighlight>) and [[And]] (<syntaxhighlight lang=apl inline>∧</syntaxhighlight>) to [[GCD]] and [[LCM]]<ref>McDonnell, Eugene. [https://www.jsoftware.com/papers/eem/gcd.htm "A Notation for the GCD and LCM Functions"].</ref>. He was also involved in the introduction of [[complex number]]s to [[SHARP APL]]<ref>McDonnell, Eugene. [https://www.jsoftware.com/papers/satn40.htm SATN-40: Complex Numbers].</ref>. His suggestion that zero divided by zero should be zero rather than one<ref>McDonnell, Eugene. [https://www.jsoftware.com/papers/eem/0div0.htm "Zero Divided by Zero"].</ref> was later adopted by [[J]]. | ||
In 1988, McDonnell and [[Ken Iverson]] developed [[function train]] notation, one of the major innovations that spurred the creation of [[J]]. | In 1988, McDonnell and [[Ken Iverson]] developed [[function train]] notation, one of the major innovations that spurred the creation of [[J]]. | ||
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=== APL conferences === | === APL conferences === | ||
{{Main|APL conference}} | |||
* [[APL73]]: The variety of definitions of a simple function. | |||
* [[APL74]]: The caret functions: Efficient algorithms for scans and reductions of eight Boolean functions. | * [[APL74]]: The caret functions: Efficient algorithms for scans and reductions of eight Boolean functions. | ||
* [[APL75]]: [https://www.jsoftware.com/papers/eem/gcd.htm A notation for the GCD and LCM functions]. | * [[APL75]]: [https://www.jsoftware.com/papers/eem/gcd.htm A notation for the GCD and LCM functions]. | ||
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* [[APL79]]: [https://www.jsoftware.com/papers/eem/residue.htm Fuzzy residue]. | * [[APL79]]: [https://www.jsoftware.com/papers/eem/residue.htm Fuzzy residue]. | ||
* [[APL80]]: [https://www.jsoftware.com/papers/eem/infinity.htm Extending APL to infinity]. With Jeffrey Shallit. | * [[APL80]]: [https://www.jsoftware.com/papers/eem/infinity.htm Extending APL to infinity]. With Jeffrey Shallit. | ||
* [[IPSA '80]]: Commercial Applications for Event Handling. | |||
* [[IPSA '82]]: [https://www.jsoftware.com/papers/eem/functional.htm APL as a Functional Programming Language]. | |||
* [[APL85]]: Promoting APL (panel). With Patricia A. Buteux, Edward M. Cherlin, Percy Feiner, Jim Lucas, Michael Sunday, and Sheryl Winton. | * [[APL85]]: Promoting APL (panel). With Patricia A. Buteux, Edward M. Cherlin, Percy Feiner, Jim Lucas, Michael Sunday, and Sheryl Winton. | ||
* [[APL86]]: [https://www.jsoftware.com/papers/eem/sqrt.htm A perfect square root routine]. | * [[APL86]]: [https://www.jsoftware.com/papers/eem/sqrt.htm A perfect square root routine]. | ||
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<references /> | <references /> | ||
{{APL community}} | {{APL community}}{{DEFAULTSORT:McDonnell}}[[Category:People]][[Category:IBM employees]][[Category:I.P. Sharp Associates employees]][[Category:Designers]][[Category:Implementers]] |