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Where can I find a library to solve a sparse complex matrix equation iteratively in C. So far I've only found libraries for direct solution to complex systems, and libraries for iterative solutions to real systems, but no solvers for iterative solutions to complex systems

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PETSc (http://www.mcs.anl.gov/petsc)

But you have to build PETSc specifically for solving complex systems.

Have a look at installation instructions for complex version: http://www.mcs.anl.gov/petsc/documentation/installation.html

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