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// Returns the camera matrix given the focal and the image itself
// img The reference to the image
// f The focal length in pixels of the camera
cv::Mat getCameraMatrix(const cv::Mat& img, const float f) {
  const int cx = img.cols / 2;
  const int cy = img.rows / 2;
  return (cv::Mat_<float>(3, 3) << f, 0, cx, 0, f, cy, 0, 0, 1);
}

// Convert a set of points to bearing

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package info.kghost.test

import java.net.InetSocketAddress
import java.nio.channels.SelectionKey
import java.nio.channels.Selector
import java.nio.channels.ServerSocketChannel
import java.nio.channels.SocketChannel
import java.nio.ByteBuffer

import scala.collection.JavaConversions.collectionAsScalaIterable

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// scala -P:continuations:enable
//Continuation对于诸如异步I/O，UI事件处理以及数据流并发之类的高级控制建造十分有帮助
import util.continuations._

object Continue{
	def say = 
	reset {
		shift {
			cf:(Int=>Int) =>
			 val even = cf(10)

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#!/bin/bash

###################################################################################
# Requirements: python3, pip3 and curl
#
# You may be probably interested on creating an isolated Python3 environment.
# A quick recipe would be:
#    $ sudo apt-get install python3-minimal curl virtualenv virtualenvwrapper
#    $ mkvirtualenv -p /usr/bin/python3 myenv
#    $ workon myenv

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#!/bin/bash

###################################################################################
# Requirements: python3, pip3 and curl
#
# You may be probably interested on creating an isolated Python3 environment.
# A quick recipe would be:
#    $ sudo apt-get install python3-minimal curl virtualenv virtualenvwrapper
#    $ mkvirtualenv -p /usr/bin/python3 myenv
#    $ workon myenv

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# Identifying character names in The Adventures of David Simple
# source: http://www.munseys.com/diskone/davidsimp.htm
#
# commands:
# ./ner.sh david_simple.txt > david_simple.ner.txt
# sed -e 's/\S\+\/[^P]\w*//g' -e 's/\s\{2,\}/\n/g' -e 's/\/PERSON//g' david_simple.ner.txt | sort | uniq -c | sort -nr | sed 's/^\s\+//' | awk '{if ($1 > 1) print $1,"\t",substr($0, length($1)+2) }'
# note: ner.sh is Stanford NER http://nlp.stanford.edu/software/CRF-NER.html

238 	 David
131 	 Cynthia

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Bash Cheat Sheet

If

If Directory Exists

Stack Overflow

if [ -d "$DIRECTORY" ]; then
  # Control will enter here if $DIRECTORY exists.
fi

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port=$1
pid=`netstat -nlp 2>/dev/null|grep ${port}|grep LISTEN|awk '{print \$NF}'|awk -F"/" '{print \$1}'`
echo $pid

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sort corpus_locations.csv | uniq -c | sort -nr > corpus_locations_count.tsv

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#Requires GNU awk 4+, but eliminates the need for a specialized CSV library to handle quoted fields that contain delimiters.
#http://www.gnu.org/software/gawk/manual/html_node/Splitting-By-Content.html
#http://stackoverflow.com/a/17287068/75386

gawk -vFPAT='[^,]*|"[^"]*"' '{print $1,$2,$3}'