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# Arythemtics
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Static codes support two types arithmetics:
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# Arithmetics
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Static codes support two types of arithmetics:
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* `double complex`: `ELEMENT_SIZE=16B`
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default mode: matrix elements of hamiltonian are assumed to be of complex numbers.
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* `double`: `ELEMENT_SIZE=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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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 arithmetics. 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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