Download R in a Nutshell by Joseph Adler PDF
By Joseph Adler
If you're contemplating R for statistical computing and information visualization, this publication presents a short and functional advisor to nearly every thing you are able to do with the open resource R language and software program setting. You ll find out how to write R features and use R applications that will help you organize, visualize, and research facts. writer Joseph Adler illustrates every one strategy with a wealth of examples from medication, company, and sports.
Updated for R 2.14 and 2.15, this moment variation contains new and accelerated chapters on R functionality, the ggplot2 info visualization package deal, and parallel R computing with Hadoop.Get begun quick with an R instructional and hundreds and hundreds of examplesExplore R syntax, items, and different language detailsFind millions of user-contributed R applications on-line, together with BioconductorLearn easy methods to use R to organize information for analysisVisualize your information with R s images, lattice, and ggplot2 packagesUse R to calculate statistical fests, healthy versions, and compute likelihood distributionsSpeed up extensive computations through writing parallel R courses for HadoopGet a whole machine connection with R"
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Extra info for R in a Nutshell
Sample text
For most development purposes, we can focus on five commonly-used verbs. 16 | Chapter 2: Fundamentals GET A GET request is used to ask a server to return a representation of a resource. ) respond with the markup necessary for your browser to render the page markup. ) are requested by the browser as further GETs. POST A POST is used to submit data to a web server. Arguably the most ubiquitous example of a POST is the humble login form. A user fills in his credentials, clicks a button, and the browser submits the data via a POST to the server.
Either approach for creating the symbol is acceptable. Anecdotally, the use of #to_sym seems to be more common in practice. If you want to get technical, one could also use #intern as well. Passing Data into Views Information constructed in the back-end of the application can be shared to the frontend view through the use of instance variables, as shown in Examples 2-18 and 2-19. Example 2-18. Creating instance variables for use in a view require 'sinatra' get '/home' do @name = 'Random User' erb :home end Example 2-19.
Sinatra provides a halt method for just this purpose as shown in Example 2-9. Example 2-9. 1... 1 500 Internal Server Error Connection: close Date: Sat, 17 Sep 2011 21:09:42 GMT Content-Type: text/html;charset=utf-8 Content-Length: 0 Closing connection #0 A status code of “500 Internal Server Error” was returned, and the text we entered was not delivered to the client (further verified by a Content-Length header of value 0). Passing a Request Depending on the structure of your application, there may be instances where you’d like to pass processing on to the next best matching route (if available).