One day, my officemate Tieming asked me about a problem that she met in her research. Suppose \(\boldsymbol{B}\) is a symmetric matrix of huge dimension and \(\boldsymbol{D}\) is a diagonal matrix with nonnegative diagonal elements. The inverse of \(\boldsymbol{B}\) is already known, how can we calculate the …
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 are allowed to choose first, which sequence will you choose?
I discussed …
Suppose you toss a symmetric dice. You are allowed to quit the game and get money which equals the total points you get at any time if 6 has never showed up. Whenever 6 shows up, the game is over and you get nothing. For example, if the first three …
I found this "probability" problem when I read a person's blog.
What's probability that two randomly chosen nature numbers are relatively prime?
It is claimed that there is a very elegant solution for this problem. This problem reminds me another one. Some people asked for an example of a 0-probability …
Install Pulseaudio if you only have ALSA. ALSA alone does NOT work with skype whatever people on the #Debian channel might think and tell you.
sudo apt-get install pulseaudio
Install pulseaudio volume control
sudo apt-get install pavucontrol
Run Skype.
Go to the Sound devices sections. Click on the Open PulseAudio …
I work as a student intern in the Credit Portfolio Risk Analysis group in a bank this summer. One Friday afternoon, Jimmy, the manager of my manager, asked me to his office and talked about our team cultures.
Ownership
Whenever you have a project,
you are the ownner.
Be proud …