pouët.net

Fibonacci

category: general [glöplog]
Fibonacci does your __int64s. Go make a demo about it.
added on the 2010-04-09 08:20:58 by kbi kbi
the formula is this:

N = B*1.44042 + 2.1399

B = number of bits
N = number in which the overflow happens

B = 32 -> N = 48
B = 64 -> N = 94
B = 128 -> N = 186
added on the 2010-04-09 09:30:20 by iq iq
[0] 0
[1] 1
[2] 1
[3] 2
[4] 3
[5] 5
[6] 8
[7] 13
[8] 21
[9] 34
[10] 55
[11] 89
[12] 144
[13] 233
[14] 377
[15] 610
[16] 987
[17] 1597
[18] 2584
[19] 4181
[20] 6765
[21] 10946
[22] 17711
[23] 28657
[24] 46368
[25] 75025
[26] 121393
[27] 196418
[28] 317811
[29] 514229
[30] 832040
[31] 1346269
[32] 2178309
[33] 3524578
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added on the 2010-04-09 10:15:20 by Skate Skate
Someone please make a graph out of the ratios of each consecutive number pair:

0,1
1,2
3,5
8,13
21,34
55,89
144,233

That's the real magic behind this pattern ;)
BB Image
added on the 2010-04-09 10:25:50 by d0DgE d0DgE
Quote:
Who is going for GMP now ?

Why use GMP when you can use SockZ?

Code: 1 0 1 ;f(n) f(n-1) n .loop COPY "f(" PRINT ")=" 3 OVER PRINT CR 3 SWAP ;n f(n-1) f(n) SWAP2 ;n f(n) f(n-1) OVER2 ;n f(n) f(n-1) f(n) + ;n f(n) f(n+1)=f(n-1)+f(n) 3 SWAP ;f(n+1) f(n) n 1 + ;f(n+1) f(n) n+1 COPY 502 SKIP= loop END


And then:
f(500)=13942322456169788013972438287040728395007025658769730726410896294832557 1622863290691557658876222521294125
f(501)=22559151616193633087251269503607207204601132491375819058863886641847462 7738686883405015987052796968498626
added on the 2010-04-09 11:57:55 by baah baah
Quote:
Go make a demo about it

I did ;D
added on the 2010-04-09 14:19:15 by d0DgE d0DgE
I'll take your sweaty sockz and raise you with some erlang. (Obviously tail call recursive)

fibseq() ->
fibout(0,0),
fibseq(1,1,0).

fibseq(Num,Cur,Prev) when Num=<505 ->
fibout(Num,Cur),
Next=Cur+Prev,
fibseq(Num+1,Next,Cur);
fibseq(_,_,_) ->
done.

fibout(Num,Cur) ->
io:format("fib(~b)=~b~n",[Num,Cur]).

---------------------------------------------------------
46> test:fibseq().
fib(0)=0
fib(1)=1
fib(2)=1
fib(3)=2
fib(4)=3
fib(5)=5
........
........
fib(501)=225591516161936330872512695036072072046011324913758190588638866418474 627738686883405015987052796968498626
fib(502)=365014740723634211012237077906479355996081581501455497852747829366800 199361550174096573645929019489792751
fib(503)=590606256885570541884749772942551428042092906415213688441386695785274 827100237057501589632981816458291377
fib(504)=955620997609204752896986850849030784038174487916669186294134525152075 026461787231598163278910835948084128
fib(505)=154622725449477529478173662379158221208026739433188287473552122093734 9853562024289099752911892652406375505
done
47>
added on the 2010-04-09 16:47:13 by whizzter whizzter
Hit me with some bbcode to get the erlang code to look right.

Code:fibseq() -> fibout(0,0), fibseq(1,1,0). fibseq(Num,Cur,Prev) when Num=<505 -> fibout(Num,Cur), Next=Cur+Prev, fibseq(Num+1,Next,Cur); fibseq(_,_, _) -> done. fibout(Num,Cur) -> io:format("fib(~b)=~b~n",[Num,Cur]).

added on the 2010-04-09 16:49:46 by whizzter whizzter
bah, humbug

mov ch, 2
mov di, cx
rep stosb
inc ax
mov ch, 120
loop1:
stosb
mov al, [di-160]
adc al, [di-80]
aaa
loop loop1
mov ch, 120
loop2:
dec di
mov dl, [di]
add dl, '0'
mov ah, 2
int 21h
loop loop2
ret
added on the 2010-04-09 17:17:13 by 216 216
funny trick.. tmdc next?
added on the 2010-04-09 17:48:02 by whizzter whizzter
Skate pwns.
added on the 2010-04-09 19:56:04 by ferris ferris
8bit always wins ;)
added on the 2010-04-09 20:24:18 by Skate Skate
Code: def number2bin(x): out = [] while x: out.append( x%2 ) x /= 2 out.reverse() return out def jump( p, c ): return p*p+c*c, (2*p+c)*c def step( p, c ): return c, p+c def fibTravel(n): marsenNumber = 2**4423-1 #quite large finite field path = number2bin(n) p,c = 1,0 #starting point for i in path[:-1]: #print "wow %s"%i if i: p,c = step( p,c ) p,c = jump( p,c ) p = p % marsenNumber c = c % marsenNumber if path[-1]: p,c = step( p,c ) return c


f[506]=25018482521039800476787234746406129961184418822485520610296557460894248 80023811520697916190803488354459633
f[507]=40480755065987553424604600984321952081987092765804349357651769670267747 33585835809797669102696140760835138
f[508]=65499237587027353901391835730728082043171511588289869967948327131161996 13609647330495585293499629115294771

and now... PANTS OFF (klękać do miecza)
f[47239817523981479281579218712460998291842112345432721649875243104932184651324] mod 2^4423 -1 =

12421344184931198544648601830917502493347503327608706306208969624803310191061042 7635944517630958231376181716158561902062371516742409767758834435441405570893269249 0450602561259903718779120441488253197926869095617763067514184727515884334112637230 1332139037829937841399389493728786442506164088168436229947622714856297347877591038 6785676258243180956427734699057184286328519447284384469511322517622057287637919668 7179969776761633888679024534385879272154396327315389970242206854673859370383360956 8295923864859224156151628458160448924962262721644912936906109989282355041651432354 4641692378708504640765043123163318928255548543957067332112463484216126702609406073 3111437620260628275611461203963739404373873986784156436983702426219753220521916385 4493584674351754290230455587980879436793113744179632757308427035131520713129243878 2293490185898684059165752267235422780507663341695583588502263319754618902661335400 7743940748039459367543417437090547746720915720587514089119330045914605529015694643 5448714961965466771621316243285186319537841741760056960409498747943724703107115611 0463537773293271210539186992574788335622957102826912974617335683942840251069600758 3385513613993134535252801139055443666499729922007030017328919033784701582189055741 6477899013650450238951963246330501173919043388156791084545260750846723881929165956 2069131629834756078711

time computing < 1[s] :)
added on the 2010-04-11 12:33:53 by krzyzan krzyzan
Ok, lets play with Fibonacci numbers and... intros 256b. :)
Intro 256 is just a sequence of bits, isn't it? - so, it could be turn into natural number. Quick and easy code:
Code: import fib #his is the file from my last post def introNumber(): f = open("puls.com","rb") #yeah.. this is THIS pulse 256b intro try: byte = f.read(1) index=0 sum=0 while byte != "": val = int(byte.encode('hex'), 16) sum += val*(256**index) byte = f.read(1) index += 1 finally: f.close() return sum print introNumber() print "--------------------------" print fib.fibTravel( introNumber() )


I took famous "puls.com" (by Rrrola), and this is its 'cardinal' number:
N=2469066419087757786373502614320482942840063612361618401365743633092392975980716 931289154898584132083843060634660070159716017606765894694095208131048764404130139 942571676241809237194399250376629592309875008358710542603558782111031400672802546 117382261399669615450098592659706089658407702494890996101367487468793340551556134 825585437760144779323403259868470521353246187388228713190065278567989763666020761 283917678223841400495559945352701439865389866933194185225205378629088776087016048 476331103894423173121806237457217143499801543356329984589245455574920863745359711 7970206952510950529863791439474064675977657075307440

And this is N'th Fibonacci number:
F[N] mod 2^4423-1= 24934934979773231435855155903385566495897265280710132185371732542822244291118091 690594232299977572177856995945482118932543297661468983441335244250572588721294086 937997244973047284321224484684635939144750580344526207529424432372120433937301353 523998801576635501092341687935113678939361731519762004714799398766132480726421555 781366785934479233742661761579983242561681764760501048306293467544704640094062734 901421980825204232608077131504263714792811109621053803296261557157548899890964050 387681563673205772767371229018187268798144407531831519604895342213946489955881001 874737816112860061658908058904682764989452078344906255336880224684099987226622173 240109400948335395168497753886287815721628952066595233043886197715090161214898096 007477875471681662012859952960038448846634419979258468615094333201491365569048005 539564692527018320561863588156715323534617748375393231923706879410655074332631047 290044220097602130262988012616582020880527350869955408170032028798424607781956523 128766011956502398012510964982177901927013108676860483313634232282650311400386646 865160824415794480324373744922120946050073632514584634958529285596890409985606492 951254709829361892636244058464988136928843294733049098774080249837639527790569206 046281906011689166780182852547160615279461533060761214783369920211847090560416223 5159752114477201234865669171370024546


Or.. we can note it as follows
F( BB Image ) mod 2^4423-1 =
249349349797732314358551559033855664958972652807101321853717325428222442911180 916905942322999775721778569959454821189325432976614689834413352442505725887212940 869379972449730472843212244846846359391447505803445262075294244323721204339373013 535239988015766355010923416879351136789393617315197620047147993987661324807264215 557813667859344792337426617615799832425616817647605010483062934675447046400940627 349014219808252042326080771315042637147928111096210538032962615571575488998909640 503876815636732057727673712290181872687981444075318315196048953422139464899558810 018747378161128600616589080589046827649894520783449062553368802246840999872266221 732401094009483353951684977538862878157216289520665952330438861977150901612148980 960074778754716816620128599529600384488466344199792584686150943332014913655690480 055395646925270183205618635881567153235346177483753932319237068794106550743326310 472900442200976021302629880126165820208805273508699554081700320287984246077819565 231287660119565023980125109649821779019270131086768604833136342322826503114003866 468651608244157944803243737449221209460500736325145846349585292855968904099856064 929512547098293618926362440584649881369288432947330490987740802498376395277905692 060462819060116891667801828525471606152794615330607612147833699202118470905604162 235159752114477201234865669171370024546


So... equation:
F[ intro256 ] mod q = x
is easy to solve... what about
F[x] mod q = intro256 ? :)

Another question is, how set q number (finite filed)? I have just taken 2**4423-1, which is prime number.

Aha, there is one mistake in my fibTravel function - there should be:
Code: if path[-1]: p,c = step( p,c ) p = p % marsenNumber c = c % marsenNumber return c


bye!
added on the 2010-04-11 15:25:09 by krzyzan krzyzan
Quote:

So... equation:
F[ intro256 ] mod q = x
is easy to solve... what about
F[x] mod q = intro256 ? :)


We are not sure that g(x)=(fib(x) mod q) is an injection (and i see no simple reason why it would be so). We shall check if there exist two numbers N, M such that g(N)=g(M)...
Also in the second part, shall not q be 2^256 to have a 256b intro as a result?
added on the 2010-04-11 16:37:31 by baah baah
Quote:

Also in the second part, shall not q be 2^256 to have a 256b intro as a result?

Yeah, if want 256b intro it should be 256^256 = 2^8*256 =2^2048 but... I think that it will be better if it will be prime number. Ex.16'th Mearsenn number 2^2203-1
http://en.wikipedia.org/wiki/Mersenne_prime
Why? I don't know - but if there is prime number, every formula is smarter. :P

And one small point. If q is prime, it is called 'finite filed' and there is a lot of webpages about its properties
added on the 2010-04-12 09:03:49 by krzyzan krzyzan
'finite field'. Once is a typo, twice a coincidence?

fib(x) mod 11 repeats the sequence 1,1,2,3,5,8,2,10,1,0. There's no solution for 4, 6, 7 and 9. Considering that 11 is a prime I doubt 2^2203-1 works any better than 2^2048.
added on the 2010-04-12 09:46:54 by 216 216
Quote:
...should be 256^256 = 2^8*256 =2^2048

Ooops... You're right, i forgot a byte has 8 bits! Shame on me! ;p
added on the 2010-04-12 12:09:40 by baah baah
Quote:

'finite field'. Once is a typo, twice a coincidence?

It was just a typo - finite field is correct of course
Quote:

fib(x) mod 11 repeats the sequence 1,1,2,3,5,8,2,10,1,0. There's no solution for 4, 6, 7 and 9. Considering that 11 is a prime I doubt 2^2203-1 works any better than 2^2048.

Yes, it is absolutely true. I found that such sequences are called Pisano periods

But...
On the other hand, not all numbers from 0...256^256 are properly constructed binaries for x86
added on the 2010-04-12 12:20:02 by krzyzan krzyzan

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