Kelvin's tech-box

Kelvin Li

Common sorting algorithms

Algorithm measurement Asymptotic analysis is used to measure the efficienty and accuracy of algrithms.It refers to computing the running time of any operation in mathmatical units of computation. Algrithm types: Best case: Minimum time required for execution Average case: Average time required for execution Wrost case: Maxinum time required

Night at the Museum Project for Udacity VR Nanodgree

What is Night at the Museum? Night at the Museum is fifth project for the Udacity Nanodegree for Virtual Reality course. The goal of this project was to create an interactive museum VR application for Google Cardboard with Unity, where the users can explore some findings (videos, audios, images and

Puzzler Project for Udacity VR Nanodgree

Puzzler Project for Udacity VR Nanodgree What is Puzzler? This puzzler project is one of the Udacity VR Nanodegree project, it is aimed to design and build a mobile VR game by Unity3D and Google VR SDK. The comfortable user experience with Cardboard devices should be considered to avoid user

Python PDB Debug

Python PDB Debug Install the pdb lib sudo pip install ipdb Set the breakpoint import ipdb; ipdb.set_trace() Manual - “import pdb” or “import ipdb as pdb“, then “pdb.set_trace()“ - n (next) - ENTER (repeat previous) - q (quit) - p <variable> (print value) -

Mail client Mutt configuration

Mutt is a powerful mail client on linux, especially when you work mostly with the terminal and want to use a terminal based mail client, mutt is a perfect match. sudo apt install libncurses-dev libncursesw5 libncursesw5-dev libsasl2-dev w3m libssl-dev ldd `which mutt` | grep curses Install Mutt Install mutt ./configure --enable-imap

GPG generate issue

When I run gpg --gen-key I got the following error message: Not enough random bytes available. Please do some other work to givethe OS a chance to collect more entropy! Soution: Open a new terminal and run find / > /dev/null This will help gpg key generation finish ASAP

Using customized i3wm on Ubuntu

Now I'm using i3wm on Ubuntu as the window manager, it's pretty handy to use and improve the my dev productivity. Better font rending Infinality is a set of Freetype patches that try to provide an improved font rendering for Linux. You can ajust the settings

Setup sftp server

Install packages kelvin@xenial:~$ sudo apt-get install openssh-server kelvin@xenial:~$ sudo groupadd sftpaccess kelvin@xenial:~$ sudo vim /etc/ssh/sshd_config Find and comment the below line Subsystem sftp /usr/lib/openssh/sftp-server Add these lines at the end of the file. Subsystem sftp internal-sftp Match group ftpaccess ChrootDirectory %h

Setup squid-deb-proxy on trusty

Why squid-deb-proxy? * No editing of files on the client side. * Use zeroconf so that clients were "zero config" * Use an existing, solid proxy solution instead of writing a new tool. * Easy to set up for a typical Linux administrator. Server Config sudo apt-get install squid-deb-proxy avahi-utils Now start

vim neocomplete issue

On my Mac, after I setup the Vim dev configuraion, usually I'd love to use http://vim.spf13.com/ to config all my plugins. Today I got the following warnings: "neocomplete does not work with this version of Vim. It requires Vim 7.3.885 or later