Shiny makes it incredibly easy to build interactive web applications with R. Automatic "reactive" binding between inputs and outputs and extensive pre-built widgets make it possible to build beautiful, responsive, and powerful applications with minimal effort.
The Shiny tutorial at http://shiny.rstudio.com/tutorial/ explains the framework in depth, walks you through building a simple application, and includes extensive annotated examples.
shiny-options for documentation about global options.
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