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Tweak CG

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Merged Martin Reinecke requested to merge tweak_cg into master Jun 28, 2017
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The conjugate gradient solver had a few problems:

  • if an initial guess x0 was given to the solver, this guess was silently changed during the solver run.
  • some quantities like alpha, beta, gamma and delta must be real-valued by construction, but were computed as complex numbers. This could have unwanted effects due to accumulation of numerical noise, so I cast the values to real type manually.
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Source branch: tweak_cg