Ben Chuanlong Du's Blog

And let it direct your passion with reason.

Useful Packages and Commands for LaTex

Math Packages

  1. \usepackage{amssymb}
    • popular math fonts
  2. \usepackage{dsfont}
    • \mathds font
  3. \usepackage{bm} % bold math symbols
    • bold math symbols
  4. \usepackage{amsmath}
    • math formulas.
  5. \usepackage{amsthm}
    • theorem environments
    • proof enviroment

List Packages

  1. \usepackage{enumerate}
    • universal list

Graphics Packages

  1. \usepackage{ifpdf}
    • allow including figures without extensions and select the right type of …

Working with Class in C++

Illustrative examples for the following discussions can be found here.

  1. It is suggested that you also provide a default constructor if you ever provide a user-defined constructor when writing a C++ class.

  2. If you want to allow deleting a derived class from a pointer of the base class, you have …

Generating YYYYMM Formatted Dates Using Python

import monthdelta as md
import datetime as dt
import math as math

def quarter(month):
    return int(math.ceil(month/3.0))
#end def

d0 = md.date.today()
dates = [d0 + md.monthdelta(i) for i in range(1, 20)]
yyyymms = [d.year*100 + d.month for d in dates]
yymms …

Common Mistakes in C++ Code and Ways to Debug

Debugging

  1. gdb is a excellent command tool for debugging C/C++ code.

Syntax Mistakes

  1. Missing "}". When this happens, you usually get lots of error message when you compile your code. And these error messages are often hard to understand and seems not related to your code.

  2. Missing template arguments. This …