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This is OpenNL, a library to easily construct and solve sparse linear systems.
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* OpenNL is supplied with a set of iterative solvers (Conjugate gradient,
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BICGSTAB, GMRes) and preconditioners (Jacobi, SSOR).
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* OpenNL can also use other solvers (SuperLU 3.0 supported as an OpenNL
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Note that to be compatible with OpenNL, SuperLU 3.0 needs to be compiled with
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the following flag (see make.inc in SuperLU3.0):
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CDEFS = -DAdd_ (the default is -DAdd__, just remove the second underscore)
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OpenNL was modified for Blender to be used only as a wrapper for SuperLU.