  Filtergraph is a web application being developed by the Vanderbilt Initiative
in Data-intensive Astrophysics (VIDA) to flexibly handle a large variety of
astronomy datasets. While current datasets at Vanderbilt are being used to
search for eclipsing binaries and extrasolar planets, this system can be easily
reconfigured for a wide variety of data sources. The user loads a flat-file
dataset into Filtergraph which instantly generates an interactive data portal
that can be easily shared with others. From this portal, the user can
immediately generate scatter plots, histograms, and tables based on the
dataset. Key features of the portal include the ability to filter the data in
real time through user-specified criteria, the ability to select data by
dragging on the screen, and the ability to perform arithmetic operations on the
data in real time. The application is being optimized for speed in the context
of very large datasets: for instance, plot generated from a stellar database of
3.1 million entries render in less than 2 seconds on a standard web server
platform. This web application has been created using the Web2py web framework
based on the Python programming language. Filtergraph is freely available at
http://filtergraph.vanderbilt.edu/.
