Python for Data Analysis - get,parse,use,plot your data in 10 minutes

'Python for Data Analysis' gave the readers a broad view of what can be done to analyse datasets using python language and ecosystem, such as R. Well organised and written chapter, was personally interested in learning visualization and large dataset handling. Python is THE language for THAT. And the book gives clear code description, graphs example result and source of the dataset. The book cover the plotting and visualization in deep details and suggest nice library such as javascript 'd3' library (d3js.org) as well as the famous 'numpy' for numerical operations and 'matplolib' for plotting data, the best plotting and charting library by far - the only library i could compare in another language is JFreeChart for java but still below in term of graphic quality and features. I have personally use d3js to plot exoplanets data in a parallel coordinates: exoplanets viz. To sum up, a great book to have, recommended for people that want to use the data, parse it, plot it and share it in 10 minutes! Link to the book shop here: Python for Data Analysis Note: This book review is in exchange of the O'Reilly Blogger Review Program (http://oreilly.com/bloggers/)

'R in a Nutshell' :: More than a "quick" desktop reference book

'R in a Nutshell' is suppose to be a reference book but is more than that! The author, J. Adler, with this second edition, refresh the first one with Hadoop ecosystem and how it integrates well with R. R in a Nutshell allows you to get working immediately. Full of example and guidelines. A 700 pages reference book for coding and learning this statistician language for parsing and visualizing data. There are a lot of information on where getting the data and how tackle the visualization, important part for decoding and analysing many data of multidimensional space. I recommended to everyone who have intereste in learning R, discovering new BigData related feature with Hadoop and as a reference book for more advance users. Link to the book shop here: R in Nutshell, 2nd Edition Note: This book review is in exchange of the O'Reilly Blogger Review Program (http://oreilly.com/bloggers/)

Building Web Applications with Erlang Working with REST and Web Sockets on Yaws By Zachary Kessin Publisher: O'Reilly Media Released: June 2012

As java/web programmer and no knowledge at all of the language Erlnag, i was expecting a lot. Gradually, the book lecture guide you to all the code and sometimes it can be difficult to read as there is lot of examples. You may need to study it with a computer in front of you. Generally, i must say that is oriented to general programmers but a knowledge of web framework and languages is a plus to understand it. The book is dense and gives everything you need to use Erlang in your web application. Link to the book: http://shop.oreilly.com/product/0636920021452.do Note: This book review is in exchange of the O'Reilly Blogger Review Program (http://oreilly.com/bloggers/)

:<: Green Aviation :>:

posted 4 minutes ago by emmanuel Joliet [ updated a minute ago ]
Green Approach is:
”Planning & execution of a approach, minimizing the environmental effect (emissions & noise) a much as possible. This is achieved by flying a Continuous Descent Approach (CDA) with minimum thrust. The Green Approach is executed from Top of Descent (ToD) using the CDA procedure”.

The advantages include:
- Mimimized noise exposure around airports
- Estimated fuel savings of 50-150 kg per approach based on calculations from Arlanda
- Cost savings for airlines due to fuel burn and increased predictability
- Reduced CO2 emissions
The Green Departure subproject will adress environmental acitivites in the departure phase of flight.

The definition of a Green Departure is:
“Planning & execution of a departure, minimizing the environmental effect (emissions & noise) a much as possible. This is achieved by using optimized procedures, methods and technical support tools that minimizes idling time on ground and allows an optimized flight path up to cruise level”

The advantages include:
- Mimimized taxi time on runway
- Increased predictability and punctuality – improved planning for airlines
- Improved airport gate allocation process and planning
- Reduced work load for ATC



PKTIGroup is looking forward to help you to accomplish such goals of minimizing environmental effects.

Tracker.

GPS/GPRS/LAN tracker exist and can be provide to track your car or a luggage just sending an sms command and receive for instance the geolocation.

Adding subversion keyword(s) to PDF

Is it possible to add $Id$ or any other subversion keyword into a PDF when commiting it?
Yes, use the hook script pre-commit and a little java program to insert svn keywords into the PDF metada!
A clue: iText

Javascript debugger to the rescue

Well, well, well, i want to start this post saying that the world of browser is a jungle! I was doing a web application and i face the problem of non compatibility DOM from a browser to another. Let me explain the problem. First of all, i will explain the functionality of part of my web application. I have an ajax call that query a database and give back an xml result. So far so good! Then i have the display result placed between

as a links list of result. My idea was to make each link react to the mouse event so i have put the typical onclick and mouseover in each links href elements of the list. The effect of the mouse over a link should get a second ajax call back to fill in a form beside the list result so the user doesn't need to click on the link and open a new window for THAT!! Then came the real problems!
Javascript + DOM + browsers = problems!
The DOM methods to get the node name are different for IE and FF. For FireFox, the 'tagName' method isn't working for IE (+6). For IE i had to use 'nodeName'. Wierd but that's how is it!
The xml is similar to:

<?xml version="1.0"?>

<root version="-live-" date="2008-11-21T14:45:24">

<item>

<foo/>

</item>

</root>


To fill the form field name 'field1' with the xml ajax response object 'resp' (XMLHttpRequest) above,

• for IE: document.getElementById("form").field1.value=resp.getElementsByTagName('root')[0].childNodes[1].nodeName;
• for 'other' browsers: document.getElementById("form").field1.value=resp.getElementsByTagName('root')[0].childNodes[1].tagName;
  

The php to ajax lookup is like:

xmlHttp=GetXmlHttpObject()

var url="livesearch.php"

url=url+"?q="+str

url=url+"&sid="+Math.random()

xmlHttp.onreadystatechange=stateChanged

xmlHttp.open("GET",url,true)

xmlHttp.send(null)



function stateChanged()

{

if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")

{

document.getElementById("anyId"). innerHTML=xmlHttp.responseText;

}

}


A nice thing that i didn't heard about since yesterday was to use Javascript debugger! And this was my salvation. I put a link where i found the useful information:
http://www.jonathanboutelle.com/mt/archives/2006/01/howto_debug_jav.html

E.J.