Adobe Flex 3 Component Life Cycle

Adobe Flex 3 Component Life Cycle View more presentations from rjowen.
Xu Cui
1 sec read

Tips for writing faster MatLab programs

Avoid using explicit loop if possible %calculating the sum of the product of corresponding element in two row vectors A and B %bad example s = 0; for i=1:100 s = s + A(i)*B(i); end %good example s = A*B'; Avoid increment memory allocation, inste
Xu Cui
16 sec read

phpBB 3 spam filter

Standard phpBB captcha is broken. I modify it such that the user need to add the numbers in captcha images and enter the result (e.g. 1+2+3=6), instead of enter the original characters (e.g. ‘123’). Enter folder /includes/ucp edit file uc
Xu Cui
28 sec read

no tissue paper

Original Video– More videos at TinyPic
Xu Cui
1 sec read

AdaBoost, Adaptive boosting

AdaBoost is an algorithm to linearly combine many classifiers and form a much better classifier. It has been widely used in computer vision (e.g. identify faces in a picture or movie). Look at the following example: How it works? First, you have a tr
Xu Cui
51 sec read

Distribution of correlation coefficient (r)

Assume you got correlation r=0.6 between two variables (N=10), is 0.6 significantly bigger than 0? Or if you observed r=0.98, is it significantly different from r=0.9? For these questions, we need to know the distribution of r of our sample, given th
Xu Cui
38 sec read