Quadratic programming
I never used QP in my practice. And I using Octave for solve HWs.
So there is builtin function for quadratic programming in Octave  qp. (example) But I still dont know what parameters I should use to solve: s.t. Looks like H is (.* is element by element product) But what is the other parameters :confused: 
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And where is ?
http://i1161.photobucket.com/albums/...7/b3472e2a.png 
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@invis
for the 100 points problem 400 iterations may be too little (i used 2000 iterations in my matlab code and in ~2% of the cases even that limit was exceeded but that still gives a decent accuracy you could use even more but don't go too far or you will never get results) also for the upper bound I used 10^5 and 10^10 without any significant change in results, 10^22 seems a bit much considering you are probably using single precision numbers:) 
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400 iterations I use only to show that ~40% of problems QP cant solve even with 10 dots. So how can I compare results with PLA ?
Jakvas you are using matlab, so maybe you can tell me am I miss something in parameters for QP ? Why almost half of problems without solution ? 
Re: Quadratic programming
try a smaller upper bound and maybe plot some of the results you do get to see if there is no serious error somewhere.

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