sqldf is an R package for runing SQL statements on R data frames, optimized for convenience. The user simply specifies an SQL statement in R using data frame names in place of table names and a database with appropriate table layouts/schema is automatically created, the data frames are automatically loaded into the database, the specified SQL statement is performed, the result is read back into R and the database is deleted all automatically behind the scenes making the database's existence transparent to the user who only specifies the SQL statement. Surprisingly this can at times be faster than the corresponding pure R calculation (although the purpose of the project is convenience and not speed). sqldf is free software published under the GNU General Public License that can be downloaded from CRAN.
In this post I reviewed some of the most important trading systems and financial librarys on the net. SFL Java Trading System Enviroment http://sourceforge.net/projects/sfljtse http://www.sflweb.org/index.php?blog=sfljtse The SFL Java Trading System Enviroment is a java application built on KISS principle (Keep It Simple,Stupid) and its aim is to provide a fast and platform indipendent infrastructure to develop and execute trading Systems. EclipseTrade http://sourceforge.net/projects/eclipsetrader/ http://eclipsetrader.sourceforge.net/ Stock exchange analysis system, featuring shares pricing watch, intraday and history charts with technical analysis indicators, level II/market depth view, news watching, automated trading systems, integrated trading. Based on Eclipse RCP framework. JsystemTrader http://code.google.com/p/jsystemtrader/ JSystemTrader is a fully automated trading system (ATS) that can trade various types of market securities during the trading day without user mo...
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