jiafulow

                      The Twelve Networking Truths

   (1)  It Has To Work.

   (2)  No matter how hard you push and no matter what the priority,
        you can't increase the speed of light.

        (2a) (corollary). No matter how hard you try, you can't make a
             baby in much less than 9 months. Trying to speed this up
             *might* make it slower, but it won't make it happen any

jiafulow

Basics of the Unix Philosophy

source: https://homepage.cs.uri.edu/~thenry/resources/unix_art/ch01s06.html

1. Rule of Modularity: Write simple parts connected by clean interfaces.
2. Rule of Clarity: Clarity is better than cleverness.
3. Rule of Composition: Design programs to be connected to other programs.
4. Rule of Separation: Separate policy from mechanism; separate interfaces from engines.
5. Rule of Simplicity: Design for simplicity; add complexity only where you must.
6. Rule of Parsimony: Write a big program only when it is clear by demonstration that nothing else will do.

jiafulow

//
// Code from "Numerical Recipe in C (2nd edition)" by Press et al. 
// Chapter 20.2 pg.896
// 

#include <cstdint>
#include <iostream>

// Return the Gray code of n
uint64_t gray(uint64_t n)

jiafulow

CXX=clang++
CXXFLAGS=-g -std=c++11 -Wall -pedantic
BIN=prog

SRC=$(wildcard *.cpp)
OBJ=$(SRC:%.cpp=%.o)

# $^ is all the dependencies
# $? is all the modified dependencies
all: $(OBJ)

jiafulow

Download the C codes and run the following commands:

$ alias rot='root -l -b -q'
$ rot create_tree.C+
$ rot clone_tree.C+

Tested in ROOT 6.06/00

jiafulow

#include "TStyle.h"

// tdrGrid: Turns the grid lines on (true) or off (false)

//void tdrGrid(bool gridOn) {
//  tdrStyle->SetPadGridX(gridOn);
//  tdrStyle->SetPadGridY(gridOn);
//}

// fixOverlay: Redraws the axis

jiafulow

Download the C codes and run the following commands:

$ alias rot='root -l -b -q'
$ rot create_vector_vars.C+
$ rot read_vector_vars.C+

Tested in ROOT 6.06/00

jiafulow

Download the C codes and run the following commands:

$ alias rot='root -l -b -q'
$ rot create_trees.C+
$ rot update_trees.C+

Tested in ROOT 6.06/00

jiafulow

#!/usr/bin/env python

import sys
import urllib2
import json

# To learn GitHub Flavored Markdown, see
#   http://guides.github.com/overviews/mastering-markdown
gh_url = 'https://api.github.com/markdown'