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Javafastcomplex has both mutable and immutable complex numbers
...Mutable complex numbers would avoid garbage-collection penalty and therefore be faster in calculations. Javafastcomplex implements both mutable and immutable complex numbers, and has a common interface for both, allowing users to write functions that can take either a mutable or an immutable complex number as an argument. Mutable complex numbers can then be used in the most performance-critical parts of the code with immutable complex numbers being used elsewhere. Performance improvement of mutable complex numbers is 10x in the best-case scenario and about 2x in real life complex number code. ...
Symbolic Plotter has been renamed to Sympl. Please visit the Sympl project. If you are using Symbolic Plotter 0.2 or earlier, please take a look at the latest version of Sympl.
A framework of configurable mathematical software components written in the Java language, meant to be used on instructional Web pages. This project will take the original version (called JCM) and modify it to use Swing and JavaBeans.
D. R. Kaprekar found an interesting behaviour of four-digit number (say, 6349). Take any number; sort its digits in ascending (3469) and descinding (9643) order; subtract these (9643 - 3469 = 6174). Repeat these steps a couple of times. Surprisingly, you'
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