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221. Re: Implementing the Dijkstra Algorithm (score: 61)

Author: "Mark Meijer" <meijer78@...>

Date: Wed, 23 Nov 2005 11:03:13 +0000

On a side note, as also suggested on that wikipedia page, and depending on what exactly you are using the algorithm for, you might want to consider using the A* algorithm instead. Or perhaps another

222. Re: Implementing the Dijkstra Algorithm (score: 447)

Author: Luis Carvalho <carvalho@...>

Date: Tue, 22 Nov 2005 12:02:46 -0500

Also for the INFs; actually, a no-edge should have distance INF, and so, just substitute INFs by nils all together. It should be faster and makes more sense in Lua. Cheers, luis. -- A mathematician

223. Re: Implementing the Dijkstra Algorithm (score: 114)

Author: Samuel Sol <samuel.sol@...>

Date: Tue, 22 Nov 2005 13:19:48 -0200

Thank you mate, I will start implementing it. The only think that will have to be diferent is how to mark when there is no edge between two nodes I will use -1, because 0 is a valid cost. :) but none

224. Re: Implementing the Dijkstra Algorithm (score: 447)

Author: Luis Carvalho <carvalho@...>

Date: Mon, 21 Nov 2005 18:32:58 -0500

Quick and dirty, following your Wikipedia link: -- test graph: if G[u][v] == 0, there is no edge between u and v G = { -- 1 2 3 4 5 6 { 0, 0, 13, 0, 16, 8 }, -- 1 { 0, 0, 0, 6, 0, 10 }, -- 2 { 13, 0

225. Re: Lua Basics: tables as lists? (score: 447)

Author: Luis Carvalho <carvalho@...>

Date: Tue, 23 Aug 2005 16:04:27 -0400

As another simple example of this -- that is, that intuition can be misleading -- consider the two functions below: function contains1 = function(t, x) for _,v in ipairs(t) do if v == x then return

226. RE: Concatenating strings with '+' (score: 18)

Author: Ignacio Burgueño <ignacio@...>

Date: Thu, 21 Jul 2005 10:40:23 -0300

Thank you very much for the patch. I forgot to mention that I'm working with 5.02, but anyway, is nice to know that 5.1 allows me to do that by means of metamethods. Regards, Ignacio

227. Re: Concatenating strings with '+' (score: 447)

Author: Luis Carvalho <carvalho@...>

Date: Thu, 21 Jul 2005 00:18:42 -0400

On Lua 5.1-work6, you can have a quick and dirty solution by simply providing a __add metamethod for strings: -- lstrlib.c.orig 2005-07-20 23:56:36.000000000 -0400 +++ lstrlib.c 2005-07-20 23:58:37.

228. [ANN] Numeric Lua 0.1 (score: 447)

Author: Luis Carvalho <carvalho@...>

Date: Tue, 19 Jul 2005 15:05:42 -0400

Ola', I'd like to announce the availability of Numeric Lua. Numeric Lua is a numerical (duh!) package for Lua. It includes support for complex numbers, multidimensional matrices, random number genera

229. Re: Lua reference manual in Vim (score: 18)

Author: "Aaron Brown" <aaron-lua@...>

Date: Wed, 1 Jun 2005 16:38:51 -0400

I'm using this now, and it's nice. Thank you. -- Aaron

230. Lua reference manual in Vim (score: 447)

Author: Luis Carvalho <carvalho@...>

Date: Thu, 26 May 2005 19:06:40 -0400

Hi, Just a quick announcement to those among us who are Vim users: I uploaded a Vim help file version of the Lua 5.0 reference manual to vim.org: http://www.vim.org/scripts/script.php?script_id=1291

231. Re: Some small requests for the next release (score: 447)

Author: Luis Carvalho <carvalho@...>

Date: Mon, 28 Feb 2005 12:14:00 -0500

<snip> If you really want math.nan (and math.inf, for that matter), you can define math.nan = 0/0 and math.inf = 1/0. But I think that math.isnan = function(x) return not (x==x) end math.isinf = func

232. Re: Module metatable (score: 447)

Author: Luis Carvalho <carvalho@...>

Date: Tue, 22 Feb 2005 10:54:59 -0500

Very reasonable. But the point is: who created the table first (and registered as global), ll_module or the module's luaL_openlib? Ah, so the rule is "only the package system should set the module's

233. Re: Module metatable (score: 447)

Author: Luis Carvalho <carvalho@...>

Date: Mon, 21 Feb 2005 14:43:18 -0500

That I understand; what I don't get is why this precludes a MT check. With respect to the module's MT, since in the initialization you only set a __index field, the assumption should be that the MT d

234. Module metatable (score: 447)

Author: Luis Carvalho <carvalho@...>

Date: Sun, 20 Feb 2005 22:54:59 -0500

Hi folks, In loadlib.c, ll_module attributes a new metatable to a module. Wouldn't it be nicer to check for a previously assigned MT first? -- loadlib.c.orig 2005-02-20 21:57:34.386838440 -0500 +++ l

235. Re: Lua 5.1w4 rearrangement (score: 447)

Author: Luis Carvalho <carvalho@...>

Date: Thu, 17 Feb 2005 13:34:55 -0500

Not to mention an almost one-time-only effort. I vote for the clearer, more versatile and powerful... _neat_ new layout. Cheers, Luis. -- A mathematician is a device for turning coffee into theorems.

236. Re: tonumber metamethod? (score: 447)

Author: Luis Carvalho <carvalho@...>

Date: Thu, 6 Jan 2005 23:02:25 -0500

Hi, First of all, sorry for the unacceptable long delay; I was still putting life back on tracks after a long holiday away from anything that resembles a computer. :) Nothing special: I was just curi

237. tonumber metamethod? (score: 447)

Author: Luis Carvalho <carvalho@...>

Date: Sun, 19 Dec 2004 19:43:17 -0500

Hi, I searched the lua-l archive, but couldn't find an answer to this: is there any particular reason why there is a tostring but not a tonumber metamethod? Cheers, Luis. -- A mathematician is a devi

238. Quick question about lua_Integer (was: Lua 5.1 (work3) now available) (score: 447)

Author: Luis Carvalho <carvalho@...>

Date: Mon, 6 Dec 2004 23:15:54 -0500

Quick question concerning luaconf.h: why is lua_Integer now set to ptrdiff_t -- and before LUA_INT32 -- instead of long? On a C99 compliant machine, lua_number2int uses lrint that returns long. Also

239. Re: Quick question about lua_Integer (was: Lua 5.1 (work3) now available) (score: 18)

Author: Mike Pall <mikelu-0412@...>

Date: Tue, 7 Dec 2004 06:42:10 +0100

Hi, 'lua_Integer' only affects four API functions. It does not affect the types inside the core. The intention behind the type definition is to offer an integer type with reasonable precision but wit

240. Re: Lua workshop (score: 61)

Author: Joseph Stewart <joseph.stewart@...>

Date: Thu, 18 Nov 2004 14:30:55 -0500

Hey, how about friendly Atlanta Georgia (?Lua in the Peach State... cool logos come to mind?)? I'd take y'all to a great "southern" cookin' place down here (or "up here", "over there" as appropriate