Full control of the power settings in Linux with Gnome Desktop can be done through dconf-editor at org->gnome->settings-daemon->plugins->power. The default way to determine low battery, critical low battery and to carray out critical low action is by counting left battery time. You can change the way …

I wrote a paper on sequential permutation test with Tim Bancroft and Dan Nettleton. The paper "T. Bancroft, C. Du and D. Nettleton (2012). Estimation of False Discovery Rate Using Sequential Permutation P­Values." has been accepted by Biometrics. To illustrate ideas in the paper and make sequential permutation test …

1. Type xrandr or xrandr -q in terminal to dispaly information of all available output device. Then you can use the following commands to set dual display.

   xrandr --output VGA1 --auto 
   xrandr --output VGA1 --same-as LVDS1 --auto
   xrandr --output VGA1 --mode 1024x800
   xrandr --output VGA1 --off
   

where VGA1 and LVDS1 should …

String

Another interesting problem I met in statistic is: suppose we flip a coin which has probability 0.7 to be head again and again and two people choose two different sequences of length 3 (e.g. THH). The people whose sequence appears first wins. If you're allowed to choose first …

Performance

1. If there is some block of useless code, the compile is smart enough to ignore it and thus speed up the program.

2. Use the option -O2 to generate optimized code when you are ready to publish your code.

3. Define variables only when needed to avoid the overhead of creating …