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A simple MATLAB implementation of Wilsons NRG-method
...For example: it is not considered, that only matrix elements between states, whos occupation number differs by one and S_z differs by 1/2.
There is only implicit parallelisation implemented by vectorizing the time consuming parts of the code.
This code is licensed under the CC BY-SA 3.0 license (http://creativecommons.org/licenses/by-sa/3.0/, http://creativecommons.org/licenses/by-sa/3.0/legalcode)