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I need to do a lot of technical computing in my Java programs. Could you advic

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Question: I need to do a lot of technical computing in my Java programs. Could you advice me, where to find free libraries to do it in most efficient way.
I do not want to reinvent a wheel, at least now Smile

Answer: Ok, there is one collection of Open Source Libraries for High Performance Scientific and Technical Computing in Java - The Colt Distribution.

This distribution consists of several free Java libraries, for user convenience bundled under one single uniform umbrella. Namely the Colt library, the Jet library, the JAL library, the RngPack library, the CoreJava library, the Concurrent library and the VNI library.
The Colt library provides fundamental general-purpose data structures optimized for numerical data, such as resizable arrays, dense and sparse matrices (multi-dimensional arrays), linear algebra, associative containers and buffer management.
The Jet library contains mathematical and statistical tools for data analysis, powerful histogramming functionality, Random Number Generators and Distributions useful for (event) simulations, and more.
The JAL library, a partial port of the C++ Standard Template Library developed by Silicon Graphics, contains a wide range of efficiently coded general-purpose algorithms on arrays.
The RngPack library contains random number generators. The CoreJava library contains C-like print formatting.
The Concurrent library contains standardized, efficient utility classes commonly encountered in parallel & concurrent programming.
Finally, the VNI library contains mathematical functions and complex numbers.

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