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# Arnoldi Iteration
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## Setup
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### Spack
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```bash shell
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$ spack env activate ./spack-env
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$ spack install
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$ spack load openblas openmpi petsc
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```
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### CMake
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To build main from main.c
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```bash shell
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$ rm -rf build
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$ mkdir build
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$ cd build
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$ cmake ..
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$ make
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$ mpirun -n 2 ./main
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```
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