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This tool provides a simple way to run/debug short scripts written in the Octave/MATLAB syntax. Upload a script from your desktop (usually stored as a .m file), or type a new one into the text area on the left-hand side. Then, click the "Run Script" button to view the results. Simple x/y plots that you request via the plot() command will be displayed first, but there is also a "debug" tab and a console area to show the printed output from the program. This isn't a complete debugging environment, but it is a handy tool that will execute short scripts and show you the results.
The GNU Octave program - http://www.gnu.org/software/octave/