ParaCode

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Team Members

1. Qiliang Chen
2. Xuan Dinh Truong

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Progress

Assignment 1

Project: LZW Compress

Introduction:

LZW stand for "Lempel–Ziv–Welch". It is a universal lossless data compression algorithm which is widely use in compressing software. It is widely used in image compress and Unix file compress. Here is a project example of LZW compressing written by c++. Here's the link for more details: https://codereview.stackexchange.com/questions/86543/simple-lzw-compression-algorithm

Basic Compile Command:(Linux)

 g++ -std=c++0x lzw.c -o lzw

To Execute Projet

• Compress file:

 ./lzw -c file.txt

• Decopress file:

 ./lzw -d file.txt

Profile

We have compress and profile for 3 different size files. The runtime for each is shown below:

To see runtime for each function, see below:

Here is graphic:

Float profile:

Here is the float profile sample for compressing file which has size 54.3MB, float profile is changed to .txt and is simplified)

Project: Grep - Count Keyword in File

Introduction:

On the Linux system, we are very familiar with the Grep command. This is a similar project to that. But this one is more simple. It just counts how many times the keyword appears in the file. After compile the program, we run it as a command like this:

Here, it counts how many 'is' are there in file 'sample.txt'.