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I had an argument with my A-Level Maths teacher at school. He insisted that we be able to deduce the equation of a trajectory from first principles, whereas I pointed out that it was easier to just remember it. He said I'd never be able to remember it, so I bet him £10 I could.
The exam came round, and they gave you the damned formula in the question. My teacher just stood behind me laughing for most of the exam.
I still can't forget it, even though I have no need to know it any more whatsoever.
y=xTanθ-(gx^2/2u^2)sec^2θ, for those who wanted to know....
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Since my engineering degree was awarded 26 years ago, and even when employed as one I rarely needed more than fundamental calculus, I've forgotten most of it. But when I do happen to need it, I know where to look - I kept my books.
"...a photo album is like Life, but flat and stuck to pages." - Shog9
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I retook Calculus I last spring for a refresher so I suppose I am pretty up and running.
A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."
-- Stephen Crane
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hello frnds!! actually m a new comer to matlab and i need th ecode for kruskal algo in matlab .it shud be dynamic type(if possible, else graph specific). by dynamic i mean dat the user will enter the no of nodes and edges and the corresponding weight and then d graph will be generated and also the mst
plz do reply me at
er.martand@gmail.com
martand shardul
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Well, there comes a good book into my mind: Cormen / Leiserson - Introducing to Algorithms[^]. There you should find minimum spanning tree and many other important algorithms. It's easy to read and if you don't know something it's a good resource.
Regards,
Ingo
------------------------------
PROST Roleplaying Game
War doesn't determine who's right. War determines who's left.
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How to speak english properly[^]
they forgot :
- no sms type.
- plain words ortograph...
also, being on a forum, no, we won't answer you on your email (we even should blame you for this, but ok, it was your first post here). do you know the purpose of a forum ?? it's about to share knowledges... answering you on your email is at the antipods of this goal.
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1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987
1234 x 8 + 4 = 9876
12345 x 8 + 5 = 98765
123456 x 8 + 6 = 987654
1234567 x 8 + 7 = 9876543
12345678 x 8 + 8 = 98765432
123456789 x 8 + 9 = 987654321
1 x 9 + 2 = 11
12 x 9 + 3 = 111
123 x 9 + 4 = 1111
1234 x 9 + 5 = 11111
12345 x 9 + 6 = 111111
123456 x 9 + 7 = 1111111
1234567 x 9 + 8 = 11111111
12345678 x 9 + 9 = 111111111
123456789 x 9 +10= 1111111111
9 x 9 + 7 = 88
98 x 9 + 6 = 888
987 x 9 + 5 = 8888
9876 x 9 + 4 = 88888
98765 x 9 + 3 = 888888
987654 x 9 + 2 = 8888888
9876543 x 9 + 1 = 88888888
98765432 x 9 + 0 = 888888888
And finally, take a look at this symmetry:
1 x 1 = 1
11 x 11 = 121
111 x 111 = 12321
1111 x 1111 = 1234321
11111 x 11111 = 123454321
111111 x 111111 = 12345654321
1111111 x 1111111 = 1234567654321
11111111 x 11111111 = 123456787654321
111111111 x 111111111 = 12345678987654321
Bombing for Peace is like F***ing For Virginity"
My Articles
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That's interesting... I'm just wondering if I can apply it to anything useful. Probably not, but still a fun exercise.
(Nice sig, BTW).
- S
50 cups of coffee and you know it's on!
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Steve Echols wrote: (Nice sig, BTW).
Thanks  That was from a T-Shirt.
Bombing for Peace is like F***ing For Virginity"
My Articles
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The version I know is "fighting" but I guess "bombing" is more relative nowadays.
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a(n) = (n + a(n - 1)*10^L(n)/(1 + 10^(n*L(n - 1) - (10^L(n - 1) - 1)/9)))*(1 + 10^((n + 1)*L(n) - (10^L(n) - 1)/9))
where L(n) = floor[log10(10n)]
11, 1212, 123123, 12341234, 1234512345, 123456123456, 12345671234567, 1234567812345678, 123456789123456789, 1234567891012345678910, 12345678910111234567891011, 123456789101112123456789101112, ...
Ryan "Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"
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Interesting. Does it carry over into number systems with bases different than 10?
The evolution of the human genome is too important to be left to chance.
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I'm almost done reading Hilbert's Tenth Problem, by Yuri V. Matiyasevich © 1996. This book is way advanced for me, but there are some interesting bits that can be found here[^].
"People who want to share their religious views with you almost never want you to share yours with them." - Anonymous
Web - Blog - RSS - Math - LinkedIn
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Well, it's not long ago, I thought about drawing a twenty sided dice (Ikosaeder on German, I don't find the English expression) with OpenGL on my own. It's easy to draw a four, six or ten sided dice, I know the formulas behind them.
But what about a twenty sided one? Of course I could sit down and figure it out on my own, but perhaps anybody knows a good source on internet where to find formulas for such geometric objects?
Regards,
Ingo
------------------------------
PROST Roleplaying Game
War doesn't determine who's right. War determines who's left.
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ihoecken wrote: Well, it's not long ago, I thought about drawing a twenty sided dice (Ikosaeder on German, I don't find the English expression) with OpenGL on my own.
I'm pretty sure you'r looking for a Icosahedron, which is a 20-sided sphere, not dice.
Anyway, this example is in delphi, but the OGL commands should be easy enough to understand...
http://www.sulaco.co.za/drawing_icosahedron_tutorial.htm[^]
Jeremy Falcon
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Jeremy Falcon wrote: I'm pretty sure you'r looking for a Icosahedron
Right.
Jeremy Falcon wrote: which is a 20-sided sphere, not dice
Well it's called dice, too: Non-cubical dice [^] but it doesn't matter, thank you for that source.
Regards,
Ingo
------------------------------
PROST Roleplaying Game
War doesn't determine who's right. War determines who's left.
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ihoecken wrote: Well it's called dice, too: Non-cubical dice [^]
 Well, I'll be. I'm learning myself, so work with me here.
ihoecken wrote: thank you for that source.
No problem.
Jeremy Falcon
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Ok, I just read that link. I think they are referring to it as a die (dice) because of it's use, not it's shape - which is still a sphere.
The distinction is important because searching for the right term will help you find the results you want - which is what I did for that link.
Jeremy Falcon
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Jeremy Falcon wrote: Ok, I just read that link. I think they are referring to it as a die (dice) because of it's use, not it's shape - which is still a sphere.
Sorry, you might be right. That's a translation problem. In German a sphere just mean a "ball" without edges, for us it's a "Polyeder" or dice (Würfel). So I learned something about English language, too.
Regards,
Ingo
------------------------------
PROST Roleplaying Game
War doesn't determine who's right. War determines who's left.
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ihoecken wrote: In German a sphere just mean a "ball" without edges
At least in the 3D world it's still considered a sphere/ball, just with fewer polygons. Of course, I'm still new to OGL myself.
Anyway, if searching for "dice" doesn't work, you at least have another option now.
Jeremy Falcon
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ihoecken wrote: In German a sphere just mean a "ball" without edges, for us it's a "Polyeder" or dice (Würfel).
Well, when I think of "sphere", I think of "ball". Maybe the English word you want is "polyhedron", which is the three-dimensional analogue of a polygon.
http://en.wikipedia.org/wiki/Polyhedron[^]
http://mathworld.wolfram.com/Polyhedron.html[^]
-- modified at 12:44 Thursday 27th July, 2006 - Clickety police on myself!
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ricecake wrote: Well, when I think of "sphere", I think of "ball". Maybe the English word you want is "polyhedron", which is the three-dimensional analogue of a polygon.
It wasn't me who said that a polyhedron is a sphere, I wondered myself.
------------------------------
PROST Roleplaying Game
War doesn't determine who's right. War determines who's left.
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Right, actually I was agreeing with you, but also giving you another search term you can use (I didn't see "polyhedron" mentioned explicitly).
--
Marcus Kwok
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ricecake wrote: Maybe the English word you want is "polyhedron", which is the three-dimensional analogue of a polygon.
Thanks for the term.
Jeremy Falcon
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