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Challenges The Pell Numbers

APL (Dyalog Classic), 20 18 17 16 bytes ⊢/,+.×⍣⎕⍨∘.+⍨⌽⍳2 Matrix implementation, requires ⎕IO←0. Thanks to @Razetime for the idea, -3 bytes by me Try it online! APL (Dyalog Classic), 19 18 byt...

posted 4y ago by Quintec‭  ·  edited 4y ago by Quintec‭

Answer
#6: Post edited by user avatar Quintec‭ · 2021-02-18T13:40:38Z (almost 4 years ago)
  • # [APL (Dyalog Classic)], <strike>20</strike> <strike>18</strike> 17 bytes
  • ⊢/,+.×⍣⎕⍨⊢∘.+⍨⌽⍳2
  • Matrix implementation, requires `⎕IO←0`. _Thanks to @Razetime for the idea, -3 bytes by me_
  • [Try it online!](https://razetime.github.io/APLgolf/?h=e9Q31dP/UdsEAwA&c=e9S1SF9HW@/w9Ee9ix/1TX3Uu@JR16JHHTP0tEHMnr2PejcbAQA&f=AwA&i=S@My4ErjMgRiUwA&r=tio&l=apl-dyalog&m=tradfn&n=f#)
  • # [APL (Dyalog Classic)], <strike>19</strike> 18 bytes
  • <!-- language-all: lang-apl -->
  • {⍵<2:⍵⋄+/∇¨⍵-1,⍳2}
  • Generic recursive implementation part 2
  • _-1 byte thanks to @Razetime_
  • [Try it online!][TIO-kl9q3svq]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9q3svq]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqHOo97NRrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8Pw2kZbOhAQA "APL (Dyalog Classic) – Try It Online"
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {×⍵:⌊0.5+(∇⍵-1)÷1-⍨2*÷2⋄1}
  • Random fun implementation
  • [Try it online!][TIO-kl9l43hh]
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {a←⍳⌈⍵÷2⋄(2*a)+.×⍵!⍨1+2×a}
  • Random fun implementation 2
  • [Try it online!][TIO-kl9lfvbo]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9lfvbo]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@ob6qn/6O2CQb/qxOB1KPezY96Oh71bj283ehRd4uGkVaiprbe4elAEcVHvSsMtY0OT0@s/Z8GVtr3qKv5Ue@aR71bDq03ftQ2EWhWcJAzkAzx8Az@n6ZgDAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9l43hh]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@vD0R71brR71dBnomWprPOpoB3J1DTUPbzfUfdS7wkjr8HajR90thrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8P03BFAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9kntpy]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqGCoYJR7f@0R20THvX2PepqftS75lHvlkPrjR@1TXzUNzU4yBlIhnh4Bv9PA@nYbGgAAA "APL (Dyalog Classic) – Try It Online"
  • # [APL (Dyalog Classic)], <strike>20</strike> <strike>18</strike> <strike>17</strike> 16 bytes
  • ⊢/,+.×⍣⎕⍨∘.+⍨⌽⍳2
  • Matrix implementation, requires `⎕IO←0`. _Thanks to @Razetime for the idea, -3 bytes by me_
  • [Try it online!](https://razetime.github.io/APLgolf/?h=e9Q31dP/UdsEAwA&c=e9S1SF9HW@/w9Ee9ix/1TX3Uu@JRxww9bRDds/dR72YjAA&f=AwA&i=S@My4ErjMgRiUwA&r=tio&l=apl-dyalog&m=tradfn&n=f#)
  • # [APL (Dyalog Classic)], <strike>19</strike> 18 bytes
  • <!-- language-all: lang-apl -->
  • {⍵<2:⍵⋄+/∇¨⍵-1,⍳2}
  • Generic recursive implementation part 2
  • _-1 byte thanks to @Razetime_
  • [Try it online!][TIO-kl9q3svq]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9q3svq]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqHOo97NRrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8Pw2kZbOhAQA "APL (Dyalog Classic) – Try It Online"
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {×⍵:⌊0.5+(∇⍵-1)÷1-⍨2*÷2⋄1}
  • Random fun implementation
  • [Try it online!][TIO-kl9l43hh]
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {a←⍳⌈⍵÷2⋄(2*a)+.×⍵!⍨1+2×a}
  • Random fun implementation 2
  • [Try it online!][TIO-kl9lfvbo]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9lfvbo]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@ob6qn/6O2CQb/qxOB1KPezY96Oh71bj283ehRd4uGkVaiprbe4elAEcVHvSsMtY0OT0@s/Z8GVtr3qKv5Ue@aR71bDq03ftQ2EWhWcJAzkAzx8Az@n6ZgDAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9l43hh]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@vD0R71brR71dBnomWprPOpoB3J1DTUPbzfUfdS7wkjr8HajR90thrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8P03BFAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9kntpy]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqGCoYJR7f@0R20THvX2PepqftS75lHvlkPrjR@1TXzUNzU4yBlIhnh4Bv9PA@nYbGgAAA "APL (Dyalog Classic) – Try It Online"
#5: Post edited by user avatar Quintec‭ · 2021-02-18T13:39:33Z (almost 4 years ago)
  • # [APL (Dyalog Classic)], 18 bytes
  • <!-- language-all: lang-apl -->
  • {⍵<2:⍵⋄+/∇¨⍵-1,⍳2}
  • Generic recursive implementation part 2
  • _-1 byte thanks to @Razetime_
  • [Try it online!][TIO-kl9q3svq]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9q3svq]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqHOo97NRrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8Pw2kZbOhAQA "APL (Dyalog Classic) – Try It Online"
  • # [APL (Dyalog Classic)], 18 bytes
  • ⊢/,+.×⍣⎕⍨(∘.+⍨⌽⍳2)
  • Matrix implementation, requires `⎕IO←0`. _Thanks to @Razetime for the idea, -2 bytes by me_
  • [Try it online!](https://razetime.github.io/APLgolf/?h=e9Q31dP/UdsEAwA&c=e9S1SF9HW@/w9Ee9ix/1TX3Uu0LjUccMPW0g41HP3ke9m400AQ&f=AwA&i=S@My4ErjMgRiUwA&r=tio&l=apl-dyalog&m=tradfn&n=f#)
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {×⍵:⌊0.5+(∇⍵-1)÷1-⍨2*÷2⋄1}
  • Random fun implementation
  • [Try it online!][TIO-kl9l43hh]
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {a←⍳⌈⍵÷2⋄(2*a)+.×⍵!⍨1+2×a}
  • Random fun implementation 2
  • [Try it online!][TIO-kl9lfvbo]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9lfvbo]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@ob6qn/6O2CQb/qxOB1KPezY96Oh71bj283ehRd4uGkVaiprbe4elAEcVHvSsMtY0OT0@s/Z8GVtr3qKv5Ue@aR71bDq03ftQ2EWhWcJAzkAzx8Az@n6ZgDAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9l43hh]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@vD0R71brR71dBnomWprPOpoB3J1DTUPbzfUfdS7wkjr8HajR90thrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8P03BFAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9kntpy]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqGCoYJR7f@0R20THvX2PepqftS75lHvlkPrjR@1TXzUNzU4yBlIhnh4Bv9PA@nYbGgAAA "APL (Dyalog Classic) – Try It Online"
  • # [APL (Dyalog Classic)], <strike>20</strike> <strike>18</strike> 17 bytes
  • ⊢/,+.×⍣⎕⍨⊢∘.+⍨⌽⍳2
  • Matrix implementation, requires `⎕IO←0`. _Thanks to @Razetime for the idea, -3 bytes by me_
  • [Try it online!](https://razetime.github.io/APLgolf/?h=e9Q31dP/UdsEAwA&c=e9S1SF9HW@/w9Ee9ix/1TX3Uu@JR16JHHTP0tEHMnr2PejcbAQA&f=AwA&i=S@My4ErjMgRiUwA&r=tio&l=apl-dyalog&m=tradfn&n=f#)
  • # [APL (Dyalog Classic)], <strike>19</strike> 18 bytes
  • <!-- language-all: lang-apl -->
  • {⍵<2:⍵⋄+/∇¨⍵-1,⍳2}
  • Generic recursive implementation part 2
  • _-1 byte thanks to @Razetime_
  • [Try it online!][TIO-kl9q3svq]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9q3svq]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqHOo97NRrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8Pw2kZbOhAQA "APL (Dyalog Classic) – Try It Online"
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {×⍵:⌊0.5+(∇⍵-1)÷1-⍨2*÷2⋄1}
  • Random fun implementation
  • [Try it online!][TIO-kl9l43hh]
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {a←⍳⌈⍵÷2⋄(2*a)+.×⍵!⍨1+2×a}
  • Random fun implementation 2
  • [Try it online!][TIO-kl9lfvbo]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9lfvbo]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@ob6qn/6O2CQb/qxOB1KPezY96Oh71bj283ehRd4uGkVaiprbe4elAEcVHvSsMtY0OT0@s/Z8GVtr3qKv5Ue@aR71bDq03ftQ2EWhWcJAzkAzx8Az@n6ZgDAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9l43hh]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@vD0R71brR71dBnomWprPOpoB3J1DTUPbzfUfdS7wkjr8HajR90thrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8P03BFAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9kntpy]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqGCoYJR7f@0R20THvX2PepqftS75lHvlkPrjR@1TXzUNzU4yBlIhnh4Bv9PA@nYbGgAAA "APL (Dyalog Classic) – Try It Online"
#4: Post edited by user avatar Quintec‭ · 2021-02-18T13:21:18Z (almost 4 years ago)
  • # [APL (Dyalog Classic)], 18 bytes
  • <!-- language-all: lang-apl -->
  • {⍵<2:⍵⋄+/∇¨⍵-1,⍳2}
  • Generic recursive implementation part 2
  • _-1 byte thanks to @Razetime_
  • [Try it online!][TIO-kl9q3svq]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9q3svq]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqHOo97NRrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8Pw2kZbOhAQA "APL (Dyalog Classic) – Try It Online"
  • # [APL (Dyalog Classic)], 18 bytes
  • ⊢/,+.×⍣⎕⍨(∘.+⍨⌽⍳2)
  • Matrix implementation _Thanks to @Razetime for the idea, -2 bytes by me_
  • [Try it online!](https://razetime.github.io/APLgolf/?h=AwA&c=M3nU1ayjrXd4@qPexY/6pj7qXWGkYPSod4uRgiEQGgAA&f=AwA&i=S@My4ErjMgRiUwA&r=tio&l=apl-dyalog&m=tradfn&n=f#)
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {×⍵:⌊0.5+(∇⍵-1)÷1-⍨2*÷2⋄1}
  • Random fun implementation
  • [Try it online!][TIO-kl9l43hh]
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {a←⍳⌈⍵÷2⋄(2*a)+.×⍵!⍨1+2×a}
  • Random fun implementation 2
  • [Try it online!][TIO-kl9lfvbo]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9lfvbo]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@ob6qn/6O2CQb/qxOB1KPezY96Oh71bj283ehRd4uGkVaiprbe4elAEcVHvSsMtY0OT0@s/Z8GVtr3qKv5Ue@aR71bDq03ftQ2EWhWcJAzkAzx8Az@n6ZgDAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9l43hh]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@vD0R71brR71dBnomWprPOpoB3J1DTUPbzfUfdS7wkjr8HajR90thrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8P03BFAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9kntpy]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqGCoYJR7f@0R20THvX2PepqftS75lHvlkPrjR@1TXzUNzU4yBlIhnh4Bv9PA@nYbGgAAA "APL (Dyalog Classic) – Try It Online"
  • # [APL (Dyalog Classic)], 18 bytes
  • <!-- language-all: lang-apl -->
  • {⍵<2:⍵⋄+/∇¨⍵-1,⍳2}
  • Generic recursive implementation part 2
  • _-1 byte thanks to @Razetime_
  • [Try it online!][TIO-kl9q3svq]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9q3svq]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqHOo97NRrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8Pw2kZbOhAQA "APL (Dyalog Classic) – Try It Online"
  • # [APL (Dyalog Classic)], 18 bytes
  • ⊢/,+.×⍣⎕⍨(∘.+⍨⌽⍳2)
  • Matrix implementation, requires `⎕IO←0`. _Thanks to @Razetime for the idea, -2 bytes by me_
  • [Try it online!](https://razetime.github.io/APLgolf/?h=e9Q31dP/UdsEAwA&c=e9S1SF9HW@/w9Ee9ix/1TX3Uu0LjUccMPW0g41HP3ke9m400AQ&f=AwA&i=S@My4ErjMgRiUwA&r=tio&l=apl-dyalog&m=tradfn&n=f#)
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {×⍵:⌊0.5+(∇⍵-1)÷1-⍨2*÷2⋄1}
  • Random fun implementation
  • [Try it online!][TIO-kl9l43hh]
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {a←⍳⌈⍵÷2⋄(2*a)+.×⍵!⍨1+2×a}
  • Random fun implementation 2
  • [Try it online!][TIO-kl9lfvbo]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9lfvbo]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@ob6qn/6O2CQb/qxOB1KPezY96Oh71bj283ehRd4uGkVaiprbe4elAEcVHvSsMtY0OT0@s/Z8GVtr3qKv5Ue@aR71bDq03ftQ2EWhWcJAzkAzx8Az@n6ZgDAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9l43hh]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@vD0R71brR71dBnomWprPOpoB3J1DTUPbzfUfdS7wkjr8HajR90thrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8P03BFAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9kntpy]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqGCoYJR7f@0R20THvX2PepqftS75lHvlkPrjR@1TXzUNzU4yBlIhnh4Bv9PA@nYbGgAAA "APL (Dyalog Classic) – Try It Online"
#3: Post edited by user avatar Quintec‭ · 2021-02-17T17:57:31Z (almost 4 years ago)
  • # [APL (Dyalog Classic)], 18 bytes
  • <!-- language-all: lang-apl -->
  • {⍵<2:⍵⋄+/∇¨⍵-1,⍳2}
  • Generic recursive implementation part 2
  • _-1 byte thanks to @Razetime_
  • [Try it online!][TIO-kl9q3svq]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9q3svq]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqHOo97NRrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8Pw2kZbOhAQA "APL (Dyalog Classic) – Try It Online"
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {×⍵:⌊0.5+(∇⍵-1)÷1-⍨2*÷2⋄1}
  • Random fun implementation
  • [Try it online!][TIO-kl9l43hh]
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {a←⍳⌈⍵÷2⋄(2*a)+.×⍵!⍨1+2×a}
  • Random fun implementation 2
  • [Try it online!][TIO-kl9lfvbo]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9lfvbo]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@ob6qn/6O2CQb/qxOB1KPezY96Oh71bj283ehRd4uGkVaiprbe4elAEcVHvSsMtY0OT0@s/Z8GVtr3qKv5Ue@aR71bDq03ftQ2EWhWcJAzkAzx8Az@n6ZgDAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9l43hh]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@vD0R71brR71dBnomWprPOpoB3J1DTUPbzfUfdS7wkjr8HajR90thrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8P03BFAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9kntpy]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqGCoYJR7f@0R20THvX2PepqftS75lHvlkPrjR@1TXzUNzU4yBlIhnh4Bv9PA@nYbGgAAA "APL (Dyalog Classic) – Try It Online"
  • # [APL (Dyalog Classic)], 18 bytes
  • <!-- language-all: lang-apl -->
  • {⍵<2:⍵⋄+/∇¨⍵-1,⍳2}
  • Generic recursive implementation part 2
  • _-1 byte thanks to @Razetime_
  • [Try it online!][TIO-kl9q3svq]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9q3svq]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqHOo97NRrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8Pw2kZbOhAQA "APL (Dyalog Classic) – Try It Online"
  • # [APL (Dyalog Classic)], 18 bytes
  • ⊢/,+.×⍣⎕⍨(∘.+⍨⌽⍳2)
  • Matrix implementation _Thanks to @Razetime for the idea, -2 bytes by me_
  • [Try it online!](https://razetime.github.io/APLgolf/?h=AwA&c=M3nU1ayjrXd4@qPexY/6pj7qXWGkYPSod4uRgiEQGgAA&f=AwA&i=S@My4ErjMgRiUwA&r=tio&l=apl-dyalog&m=tradfn&n=f#)
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {×⍵:⌊0.5+(∇⍵-1)÷1-⍨2*÷2⋄1}
  • Random fun implementation
  • [Try it online!][TIO-kl9l43hh]
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {a←⍳⌈⍵÷2⋄(2*a)+.×⍵!⍨1+2×a}
  • Random fun implementation 2
  • [Try it online!][TIO-kl9lfvbo]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9lfvbo]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@ob6qn/6O2CQb/qxOB1KPezY96Oh71bj283ehRd4uGkVaiprbe4elAEcVHvSsMtY0OT0@s/Z8GVtr3qKv5Ue@aR71bDq03ftQ2EWhWcJAzkAzx8Az@n6ZgDAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9l43hh]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@vD0R71brR71dBnomWprPOpoB3J1DTUPbzfUfdS7wkjr8HajR90thrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8P03BFAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9kntpy]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqGCoYJR7f@0R20THvX2PepqftS75lHvlkPrjR@1TXzUNzU4yBlIhnh4Bv9PA@nYbGgAAA "APL (Dyalog Classic) – Try It Online"
#2: Post edited by user avatar Quintec‭ · 2021-02-17T17:43:38Z (almost 4 years ago)
  • # [APL (Dyalog Classic)], 19 bytes
  • <!-- language-all: lang-apl -->
  • {⍵<2:⍵⋄+/∇¨⍵-1 1 2}
  • Generic recursive implementation part 2
  • [Try it online!][TIO-kl9kntpy]
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {×⍵:⌊0.5+(∇⍵-1)÷1-⍨2*÷2⋄1}
  • Random fun implementation
  • [Try it online!][TIO-kl9l43hh]
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {a←⍳⌈⍵÷2⋄(2*a)+.×⍵!⍨1+2×a}
  • Random fun implementation 2
  • [Try it online!][TIO-kl9lfvbo]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9lfvbo]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@ob6qn/6O2CQb/qxOB1KPezY96Oh71bj283ehRd4uGkVaiprbe4elAEcVHvSsMtY0OT0@s/Z8GVtr3qKv5Ue@aR71bDq03ftQ2EWhWcJAzkAzx8Az@n6ZgDAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9l43hh]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@vD0R71brR71dBnomWprPOpoB3J1DTUPbzfUfdS7wkjr8HajR90thrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8P03BFAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9kntpy]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqGCoYJR7f@0R20THvX2PepqftS75lHvlkPrjR@1TXzUNzU4yBlIhnh4Bv9PA@nYbGgAAA "APL (Dyalog Classic) – Try It Online"
  • # [APL (Dyalog Classic)], 18 bytes
  • <!-- language-all: lang-apl -->
  • {⍵<2:⍵⋄+/∇¨⍵-1,⍳2}
  • Generic recursive implementation part 2
  • _-1 byte thanks to @Razetime_
  • [Try it online!][TIO-kl9q3svq]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9q3svq]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqHOo97NRrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8Pw2kZbOhAQA "APL (Dyalog Classic) – Try It Online"
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {×⍵:⌊0.5+(∇⍵-1)÷1-⍨2*÷2⋄1}
  • Random fun implementation
  • [Try it online!][TIO-kl9l43hh]
  • # [APL (Dyalog Classic)], 26 bytes
  • <!-- language-all: lang-apl -->
  • {a←⍳⌈⍵÷2⋄(2*a)+.×⍵!⍨1+2×a}
  • Random fun implementation 2
  • [Try it online!][TIO-kl9lfvbo]
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9lfvbo]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@ob6qn/6O2CQb/qxOB1KPezY96Oh71bj283ehRd4uGkVaiprbe4elAEcVHvSsMtY0OT0@s/Z8GVtr3qKv5Ue@aR71bDq03ftQ2EWhWcJAzkAzx8Az@n6ZgDAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9l43hh]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@vD0R71brR71dBnomWprPOpoB3J1DTUPbzfUfdS7wkjr8HajR90thrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8P03BFAA "APL (Dyalog Classic) – Try It Online"
  • [APL (Dyalog Classic)]: https://www.dyalog.com/
  • [TIO-kl9kntpy]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqGCoYJR7f@0R20THvX2PepqftS75lHvlkPrjR@1TXzUNzU4yBlIhnh4Bv9PA@nYbGgAAA "APL (Dyalog Classic) – Try It Online"
#1: Initial revision by user avatar Quintec‭ · 2021-02-17T15:37:34Z (almost 4 years ago) 
# [APL (Dyalog Classic)], 19 bytes

<!-- language-all: lang-apl -->

    {⍵<2:⍵⋄+/∇¨⍵-1 1 2}

Generic recursive implementation part 2

[Try it online!][TIO-kl9kntpy]

# [APL (Dyalog Classic)], 26 bytes

<!-- language-all: lang-apl -->

    {×⍵:⌊0.5+(∇⍵-1)÷1-⍨2*÷2⋄1}

Random fun implementation

[Try it online!][TIO-kl9l43hh]

# [APL (Dyalog Classic)], 26 bytes

<!-- language-all: lang-apl -->

    {a←⍳⌈⍵÷2⋄(2*a)+.×⍵!⍨1+2×a}

Random fun implementation 2

[Try it online!][TIO-kl9lfvbo]

[APL (Dyalog Classic)]: https://www.dyalog.com/
[TIO-kl9lfvbo]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@ob6qn/6O2CQb/qxOB1KPezY96Oh71bj283ehRd4uGkVaiprbe4elAEcVHvSsMtY0OT0@s/Z8GVtr3qKv5Ue@aR71bDq03ftQ2EWhWcJAzkAzx8Az@n6ZgDAA "APL (Dyalog Classic) – Try It Online"

[APL (Dyalog Classic)]: https://www.dyalog.com/
[TIO-kl9l43hh]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@vD0R71brR71dBnomWprPOpoB3J1DTUPbzfUfdS7wkjr8HajR90thrX/0x61TXjU2/eoq/lR75pHvVsOrTd@1DbxUd/U4CBnIBni4Rn8P03BFAA "APL (Dyalog Classic) – Try It Online"

[APL (Dyalog Classic)]: https://www.dyalog.com/
[TIO-kl9kntpy]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v@/@lHvVhsjKyD5qLtFW/9RR/uhFUCOrqGCoYJR7f@0R20THvX2PepqftS75lHvlkPrjR@1TXzUNzU4yBlIhnh4Bv9PA@nYbGgAAA "APL (Dyalog Classic) – Try It Online"