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 …
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 …
If there is some block of useless code, the compile is smart enough to ignore it and thus speed up the program.
Use the option -O2 to generate optimized code when you are ready to publish your code.
Define variables only when needed to avoid the overhead of creating …
Check [here[(https://github.com/dclong/cearn/tree/master/lambda) for illustrative examples for the following discussions.
When capture variables,
you can define new variables in the [] of a lambda expression.
For example,
if a lambda function need the sum of two double variable x and y,
you …
The kernel of Linux is usually very stable, but the existing free desktop environments are craps. Amongs these desktop environments I tried (Gnome, Xfce, LXDE and so on), none is even close to the desktop environments in Windows and Mac. I do not require desktop environments in Linux to be …