Erlang Concurrency
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The document discusses using Erlang's concurrency features to perform password cracking via brute force by dividing the search space across multiple processes. It describes representing strings as numbers and dividing the search of all possible 3-letter strings among multiple processes to check hashes faster than a single process. Testing was done on Amazon EC2 using 8-core instances to demonstrate the performance benefits of Erlang's concurrency for this type of task.
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This document discusses strings in Python. It defines strings as sequences of characters that can contain letters, numbers, and special characters. Strings are immutable and can be manipulated using built-in functions like len(), min(), max() as well as string methods. Common string operations include concatenation, slicing, formatting, comparison, searching, and conversion methods. The document provides examples of using these string functions and methods.
Regular expressions
Regular expressions (regex) allow complex pattern matching in text. The document discusses regex basics like literals, character classes, quantifiers, and flags in Python. It explains how to use the re module to compile patterns into RegexObjects and search/match strings. RegexObjects provide reusable patterns while re module functions provide shortcuts but cache compiled patterns.
The Error of Our Ways
A spreadsheet error in a 2010 research paper by Carmen Reinhart and Kenneth Rogoff undermined their conclusion that high debt-to-GDP ratios correlate with lower economic growth. Specifically, the paper incorrectly excluded several countries with debt over 90% GDP from its analysis, weakening the claimed relationship between high debt and slow growth that was influential in policymaking. The error was revealed in 2013 through independent research, demonstrating how easily mistakes can propagate in spreadsheets and the importance of transparent data and methodology.
Lecture 10.pdf
The document summarizes key concepts about strings and regular expressions in Java. It discusses that strings are immutable sequences of characters represented by the String class, and how to manipulate strings. It also covers that regular expressions provide a concise way to match patterns in strings using special characters. Finally, it notes that the StringBuffer and StringBuilder classes allow mutable string operations by modifying objects instead of creating new String objects.
Introduction to Erlang
This document provides an introduction to the Erlang programming language. It demonstrates Erlang's core syntax including numbers, atoms, booleans, strings, lists, tuples, and pattern matching. It also shows functions, guards, recursion, higher order functions, list comprehensions, and common list functions. The document introduces Erlang processes for concurrency and messaging, and discusses fault tolerance and distribution. Examples include functions, FizzBuzz, and profiling process spawning. The conclusion discusses tail call recursion, asynchronous programming, small functions, spawning processes, and handling process deaths.
String and string manipulation
Here are solutions to the exercises:
1. Reverse a string:
```java
public static String reverse(String str) {
StringBuilder sb = new StringBuilder(str);
return sb.reverse().toString();
}
```
2. Check brackets in an expression:
```java
public static boolean areBracketsBalanced(String expr) {
Stack<Character> stack = new Stack<>();
for(char c : expr.toCharArray()) {
if(c == '(' || c == '[' || c == '{') {
stack.push(c);
} else if(c == ')' && !stack.isEmpty() && stack.pop() == '(')
Open course(programming languages) 20150225
This document discusses programming language parsers and abstract syntax trees. It contains the following key points:
1) A parser takes a sequence of tokens as input and outputs a parse tree representing the syntactic structure according to a grammar. The tree structure is convenient for computers to interpret even if cumbersome for humans.
2) Parsers can build the parse tree either top-down or bottom-up. An abstract syntax tree then simplifies the parse tree, removing details not needed for semantic analysis.
3) Tools like Python Lex-Yacc can generate parsers from grammar rules and token definitions, allowing the construction and use of parsers and abstract syntax trees for programming languages.
codin9cafe[2015.02.25]Open course(programming languages) - 장철호(Ch Jang)
This document discusses programming language parsers and abstract syntax trees. It covers topics like:
- The process of syntactical analysis and turning a sequence of tokens into a parse tree.
- How parse trees represent the syntactic structure of a string according to a grammar and why they are useful for computers.
- The two main approaches for building a parse tree - top-down and bottom-up parsing.
- How Python's lex-yacc module can be used to generate a parser from grammar rules and build an abstract syntax tree.
CoderDojo: Intermediate Python programming course
This is the presentation for the three-session intermediate Python programming course which I developed and successfully presented for the CoderDojo workshop held in Microsoft Silicon Valley in March 2016.
Thinking Functionally In Ruby
The document discusses functional programming concepts in Ruby. It begins by stating that functional programming and Enumerable methods can be useful in Ruby. It then provides examples of various Enumerable methods like zip, select, partition, map, and inject. It encourages thinking functionally by avoiding side effects, mutating values, and using functional parts of the standard library. The document concludes by suggesting learning a true functional language to further improve functional programming skills.
Python slide
The document provides information about an introduction to Python programming presented by Kiattisak Anoochitarom. It begins with welcoming messages and details about the presenter. It then discusses various Python topics like data types, operators, control flow statements, functions, built-in functions, and string and list methods. Examples are provided throughout to demonstrate different Python concepts and syntax. The goal is to teach the basics of the Python language.
app4.pptx
The WiMAX (IEEE 802.16e) standard offers peak data rates of 128Mbps downlink and
56Mbps uplink over 20MHz wide channels whilst the new standard in development, 4G
WiMAN-Advanced (802.16m) is targeting the requirements to be fully 4G using 64Q QAM,
BPSK and MIMO technologies to reach the 1Gbps rate. It is predicted that in an actual
deployment, using 4X2 MIMO in an urban microcell application using a 20 MHz TDD
channel, the 4G WiMAN-Advanced system will be able to support 120Mbps downlink and
60Mbps uplink per site concurrently. WiMAX applications are already in use in many countries
globally but research in 2010 gave results that showed only just over 350 set ups were actually
in use. Many previous WiMAX operators were found to have moved to LTE along with Yota,
who were the largest WiMAX operator in the world.
Python Strings.pptx
Strings in Python can be defined using single quotes, double quotes, or triple quotes for multiline strings. Strings have many built-in methods that allow you to modify, slice, check, count, and format string values. Common string methods include upper(), lower(), strip(), replace(), split(), format(), isX() checker methods, and slice to extract substrings.
Python quickstart for programmers: Python Kung Fu
The document provides an overview of key Python concepts including data types, operators, control flow statements, functions, objects and classes. It discusses lists in depth, covering creation, iteration, searching and common list methods. It also briefly touches on modules, exceptions, inheritance and other advanced topics.
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The second lecture of the ACM Aleppo CPC training. The local contest of ICPC. This lecture will help you get started in programming contests word with the lower bound techniques. The lectures focus on the C++ programming language and the STL library to solve programming problems.
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/Regex makes me want to (weep|give up|(╯°□°)╯︵ ┻━┻)\.?/i
/Regex makes me want to (weep|give up|(╯°□°)╯︵ ┻━┻)\.?/i
codin9cafe[2015.02.25]Open course(programming languages) - 장철호(Ch Jang)
codin9cafe[2015.02.25]Open course(programming languages) - 장철호(Ch Jang)
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Erlang Concurrency
- 2. Er-what?
- 6. Why Erlang?
- 11. Erlang 101
- 25. Pattern Matching and Recursion
- 26. Fun() with anonymous functions
- 34. Back to the Passwords
- 40. Check all strings between “aa” and “zz”
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- 53. Spawn N processes lists:foreach(fun(X),[list]).
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