Tree diagrams are helpful to illustrate the differences between tacit and
explicit definitions.
comb
┌─ <
┌─ @ ─┴─ #
┌─ ~ ─── " ─┴─ 1
│
──┤ ┌─ [:
│ ├─ #:
└─────┤ ┌─ [:
│ ├─ i.
└─────┤ ┌─ 2
└─────┼─ ^
└─ #
combe
┌─ ]
│ ┌─ [:
│ ┌────┼─ <
├─ ~ ─── " ─┤ └─ #
──┤ └─ 1
│ ┌─ [:
│ ├─ #:
└─────┤ ┌─ [:
│ ├─ i.
└─────┤ ┌─ 2
└────┼─ ^
└─ #
Linda
-----Original Message-----
From: Programming <[email protected]> On Behalf Of Linda
Alvord
Sent: Thursday, March 14, 2019 12:55 AM
To: [email protected]
Subject: Re: [Jprogramming] new tasks at rosettacode.org
Well Dave, I finally wrote and explicit definition for the last atop.
comb '135'
┌┬─┬─┬──┬─┬──┬──┬───┐
││5│3│35│1│15│13│135│
└┴─┴─┴──┴─┴──┴──┴───┘
combe=: 13 :'y ([:<#)"1~ #: i. 2 ^ # y'
combe '135'
┌┬─┬─┬──┬─┬──┬──┬───┐
││5│3│35│1│15│13│135│
└┴─┴─┴──┴─┴──┴──┴───┘
Linda
-----Original Message-----
From: Programming <[email protected]> On Behalf Of Linda
Alvord
Sent: Sunday, March 10, 2019 11:34 AM
To: [email protected]
Subject: Re: [Jprogramming] new tasks at rosettacode.org
Hi Dave,
Two @;@'s down. One to go.
fe=: 13 :'\:~_".;({~ [:perm#)L:_1 }.comb y'
(fe '135')-:f '135'
1
f
[: \:~ _ ". [: ; [: ({~ perm@#)L:_1 }.@comb
fe
[: \:~ _ ". [: ; [: ({~ ([: perm #))L:_1 [: }. comb
My native language is explicit.
Linda
-----Original Message-----
From: Programming <[email protected]> On Behalf Of Linda
Alvord
Sent: Tuesday, March 5, 2019 9:22 AM
To: [email protected]
Subject: Re: [Jprogramming] new tasks at rosettacode.org
Hi Dave,
Beautiful J and only 3 @'s!
Linda
'
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------
From: David Lambert <[email protected]>
Date: 3/5/19 8:06 AM (GMT-05:00)
To: programming <[email protected]>
Subject: [Jprogramming] new tasks at rosettacode.org
I submitted entries to many newly seen by me rosetta code tasks. There was some
low hanging fruit, such as involving totients.
There is a stretch goal for
https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Frosettacode.org%2Fwiki%2FLargest_number_divisible_by_its_digits&data=02%7C01%7C%7Cf836faa20a8f4bce496b08d6a83930fc%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636881360917110741&sdata=LmnqJpUhW77JRhEwc4FPPJkzmWpRPrPT4Za4JtRrdDM%3D&reserved=0
to work in base 16. I solved the problem in base 7 instead to show how it
might be done without bothering to figure out if I had the resources for all
permutations of all combinations of fifteen digits. 0 isn't one of the digits.
Enjoy, Dave
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