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Only [[dzaima/APL]] allows <source lang=apl inline>(A h)</source>, which it treats as <source lang=apl inline>A∘h</source>.<ref>dzaima/APL: [https://github.com/dzaima/APL/blob/ceea05e25687988ed0980a4abf4b9249b736543f/docs/differences.txt#L19 Differences from Dyalog APL]. Retrieved 09 Jan 2020.</ref> | Only [[dzaima/APL]] allows <source lang=apl inline>(A h)</source>, which it treats as <source lang=apl inline>A∘h</source>.<ref>dzaima/APL: [https://github.com/dzaima/APL/blob/ceea05e25687988ed0980a4abf4b9249b736543f/docs/differences.txt#L19 Differences from Dyalog APL]. Retrieved 09 Jan 2020.</ref> See [[Bind]]. | ||
== Examples == | == Examples == | ||
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=== Fractions === | === Fractions === | ||
We can convert decimal numbers to fractions. For example, we can convert <math>2.625</math> to the improper fraction <math>21 | We can convert decimal numbers to fractions. For example, we can convert <math>2.625</math> to the improper fraction <math>\tfrac{21}{8}</math> with | ||
<source lang=apl> | <source lang=apl> | ||
(1∧⊢,÷)2.625 | (1∧⊢,÷)2.625 | ||
21 8 | 21 8 | ||
</source> | </source> | ||
Alternatively, we can convert it to the mixed fraction <math>2{5 | Alternatively, we can convert it to the mixed fraction <math>2\tfrac{5}{8}</math> with a mixed fraction: | ||
<source lang=apl> | <source lang=apl> | ||
(1∧0 1∘⊤,÷)2.625 | (1∧0 1∘⊤,÷)2.625 | ||
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===The Number of the Beast=== | ===The Number of the Beast=== | ||
The following expression for computing the [[wikipedia:666 (number)| | The following expression for computing the [[wikipedia:666 (number)|number of the Beast]] (and of [[I.P. Sharp]]'s APL-based email system, [[666 BOX]]) nicely illustrates how to read a train. | ||
<source lang=apl> | <source lang=apl> | ||
((+.×⍨⊢~∘.×⍨)1↓⍳)17 ⍝ Accursed train | ((+.×⍨⊢~∘.×⍨)1↓⍳)17 ⍝ Accursed train | ||
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== External links == | == External links == | ||
== Tutorials == | === Tutorials === | ||
* Dyalog: [http://help.dyalog.com/16.0/Content/RelNotes14.0/Function%20Trains.htm version 14.0 release notes] | * Dyalog: [http://help.dyalog.com/16.0/Content/RelNotes14.0/Function%20Trains.htm version 14.0 release notes] | ||
* [[APL Cultivation]]: [https://chat.stackexchange.com/rooms/52405/conversation/lesson-23-transcribing-to-and-reading-trains Transcribing to and reading trains] | * [[APL Cultivation]]: [https://chat.stackexchange.com/rooms/52405/conversation/lesson-23-transcribing-to-and-reading-trains Transcribing to and reading trains] | ||
* APLtrainer: [https://www.youtube.com/watch?v=kt4lMZbn-so How to read trains in Dyalog APL code] (video) | * [[APLtrainer]]: [https://www.youtube.com/watch?v=kt4lMZbn-so How to read trains in Dyalog APL code] (video) | ||
* APLtrainer: [https://www.youtube.com/watch?v=A2LqqBosvY0 Function trains in APL] (video) | * [[APLtrainer]]: [https://www.youtube.com/watch?v=A2LqqBosvY0 Function trains in APL] (video) | ||
* [[Dyalog webinar]]: [https://www.youtube.com/watch?v=Enlh5qwwDuY?t=440 Train Spotting in Dyalog APL] (video) | * [[Dyalog webinar]]: [https://www.youtube.com/watch?v=Enlh5qwwDuY?t=440 Train Spotting in Dyalog APL] (video) | ||
* [[Dyalog '13]]: [https://www.youtube.com/watch?v=7-93GzDqC08 Train Spotting in Version 14.0] (video) | * [[Dyalog '13]]: [https://www.youtube.com/watch?v=7-93GzDqC08 Train Spotting in Version 14.0] (video) | ||
== Documentation == | === Documentation === | ||
* [http://help.dyalog.com/16.0/Content/RelNotes14.0/Function%20Trains.htm Announcement] | * [http://help.dyalog.com/16.0/Content/RelNotes14.0/Function%20Trains.htm Announcement] | ||
* [http://help.dyalog.com/latest/Content/Language/Introduction/Trains.htm Dyalog] | * [http://help.dyalog.com/latest/Content/Language/Introduction/Trains.htm Dyalog] | ||
==References== | == References == | ||
<references/> | <references/> | ||
{{APL syntax}}[[Category:Tacit programming| ]] | {{APL syntax}}[[Category:Tacit programming| ]] | ||