JoyCog: Check-in [8e5a99e87b]

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Overview

Comment:	First commit, adding new file. Almost working
Downloads:	Tarball \| ZIP archive \| SQL archive
Timelines:	family \| descendants \| origin/master \| trunk
Files:	files \| file ages \| folders
SHA3-256:	8e5a99e87b2169712f2737790a5a2004e753ca251132db5a9cdcf9f79d0badae
User & Date:	base@atomicules.co.uk 2014-02-05 12:18:45

Context

2014-02-06
10:17		Correct qsort1, don't nest gear pairs, build up triples and concat The qsort1 definition was wrong, hence the comment about the wrong result. I'd forgot that `swap23` mentioned here: http://www.kevinalbrecht.com/code/joy-mirror/j06prg.html isn't just `swap`, but rather `[swap] dip`. However, before I realised that I wondered if the nested gear pairs was the issue and decided to build up a flatter list. I.e. [ [ 4.16667 12 50] ... ] as opposed to [ [ 4.16667 [12 50] ] ... ]. I think I prefer this approach anyway as rather than build up a list of ratios, then a list of pairs and then zip these together, can build up two lists of triples and just concat these. check-in: 4535761621 user: base@atomicules.co.uk tags: origin/master, trunk
2014-02-05
12:18		First commit, adding new file. Almost working check-in: 8e5a99e87b user: base@atomicules.co.uk tags: origin/master, trunk

Changes

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Added joycog.joy.

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(* joycog.joy *)
(* Given two lists of gear sprockets will calculate all ratios *)

DEFINE

	(* Constants. Ultimately these want to be arguments to the programme *)

	littlegears == [12 13 15 17 19 21 23 26];
	biggears == [30 50];

	(* Calculate Ratios *)

	biggear1 == biggears first 1.0 *;
	biggear2 == biggears second 1.0 *;

	ratios1 == [biggear1 swap /] map;
	ratios2 == [biggear2 swap /] map;

	ratios == littlegears dup ratios2 swap ratios1 concat;

	(* Make up gear pairs *)

	(* Since can't find a way to format integer as string, rather than list 
	    results as [ [ 4.16667 "50/12" ] ... ], list as [ [ 4.16667 [ 50 12 ] ] ... ]
	 *)

	pairs1 == [ biggear1 unitlist cons] map;
	pairs2 == [ biggear2 unitlist cons] map;

	pairs == littlegears dup pairs2 swap pairs1 concat;

	(* Zip together *)

	ratiosandpairs == ratios pairs zip;

	(* Sort *)

	qsort1 == [ small ]
			  [ ]
			  [ uncons [[first] unary2 > ] split ]
			  [ swap cons concat ]
			  binrec;

	sorted == ratiosandpairs sorted.

	(* Almost working, but list is a bit flattened and includes empty lists *)