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# Arythemtics
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Static codes support two types arithmetics:
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* `double complex`: `ESIZE=16B`
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default mode: matrix elements of hamiltonian are assumed to be of complex numbers.
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* `double`: `ESIZE=8B`
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if you know that matrix elements, as well as the solution, will be real numbers (for examples based on symmetries of your problem) you can speed-up the calculation process by switching to double arythmetics. To do this you need to activate in [predefines.h](https://gitlab.fizyka.pw.edu.pl/gabrielw/wslda/-/blob/public/st-project-template/predefines.h) flag:
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```c
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/**
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* activate this if you know that Hamiltonian matrix is real,
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* the code will utilize it in order to speed-up the calculations
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* */
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#define MATRIX_IS_REAL
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```
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# st-wslda-3d
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3D version of the code diagonalized matrix of size: `matrix_size = NX*NY*NZ*2`.
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Memory needed TODO |
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\ No newline at end of file |
