148 reputation
7
bio website
location Taiwan
age 18
visits member for 2 years, 5 months
seen Jun 29 at 13:58

A teenage, eager-to-learn C++/Objective-C developer. I am currently in a high school club which teaches C++ language. Since it is my first year in the club. I am advised to enter a competition next year. But frankly speaking, I have a lot to learn. So, I hope, if anyone who can help me, would be happy to share their knowledge, and help me learn more. Thanks a lot.

Developement Info :

C++ : Dev-C++ or Visual Studio 2010 (both on Windows 7)

Objective-C : XCode 4.4 (on Mountain Lion DP 12A128p)


Sep
24
awarded  Autobiographer
Oct
19
asked Minimize $ab+bc+ca$ under three second degree constraints
Sep
29
comment Am I missing anything when doing this taylor expansion?
@njguliyev I'll go kill myself, I'm sorry for posting stupid question here. You wanna post it as an answer or delete it?
Sep
29
asked Am I missing anything when doing this taylor expansion?
Sep
22
comment How to define “closer to proportion”
I see. Thanks a lot!
Sep
19
awarded  Scholar
Sep
19
comment How to define “closer to proportion”
So the idea is to turn my proportion into vector for calculation. And use Uniform Norm?
Sep
19
accepted How to define “closer to proportion”
Sep
19
comment How to define “closer to proportion”
@copper.hat sum of absolute difference, I will think about that. But how? For example 1 : 3 : 5 and 3 : 4 : 5, one can say their absolute difference is 2 + 1 + 0 = 3 but if we take 1 : 3 : 5 and multiply it by 4/3, we get 4/3 : 4 : 20/3, and their difference will become 5/3 + 0 + 5/3 = 10 / 3, a bit larger than 3. So there will be cases where there are different difference for two proportions.
Sep
19
asked How to define “closer to proportion”
Jan
2
awarded  Commentator
Jan
2
comment Why is ab+bc+ac = 0 in some situation?
@RossMillikan Well, thanks anyway.
Jan
2
comment Why is ab+bc+ac = 0 in some situation?
@RossMillikan That's what I mean by "Hell, it's still wrong" I mean my calculation is correct, but it only happens in VERY VERY special situation. So, yes, the idea is wrong.
Jan
2
awarded  Citizen Patrol
Jan
2
comment Why is ab+bc+ac = 0 in some situation?
@RossMillikan But hell, it's still wrong, and I think the question itself is not constructive. LOL
Jan
2
comment Why is ab+bc+ac = 0 in some situation?
@RossMillikan Here's where I think I am right about organizing it: $(a+b-c)^2 = a^2+b^2+c^2+2ab-2bc-2ac$ And $2m^2n^2-2c^2=2ab-2bc-2ac$ I can simply substitute it. $(a+b-c)^2 = a^2+b^2+c^2+2m^2n^2-2c^2$ And here you go, $2m^2n^2-2c^2$ should be zero, which means $2ab-2bc-2ac$ should also be zero.
Jan
2
comment Why is ab+bc+ac = 0 in some situation?
I think I should start to put this under trash.
Jan
2
comment Why is ab+bc+ac = 0 in some situation?
ALL: I think I should consider putting this under CS, and simply ask: How to do this without overflow. THOUGH $a = MAX$, $b = MAX$, $c = MAX$, and $\sqrt{a^2 + b^2 + c^2} > MAX$
Jan
2
comment Why is ab+bc+ac = 0 in some situation?
@Cocopuffs Ya, I really want to say it's a false positive. But, since I can't. You win? The problem still remain though, why is it correct under some condition?
Jan
2
revised Why is ab+bc+ac = 0 in some situation?
added 203 characters in body