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Gram schmidt arnoldi

Nicolas Tancogne-Dejean requested to merge gram_schmidt_arnoldi into develop

Description

Add the possibility to select the Gram-Schmidt scheme used for the Arnoldi process (used for Lanczos exponential method). This is unclear if this improve the stability of the time-propagation. Also, the normalization of the last Arnoldi vector is done only if the norm is non-zero, which seems to improve the stability, see attached plot.

gauge_field_norm.pdf

News snippet

Add the possibility to select the Gram-Schmidt scheme used for the Arnoldi process (used for Lanczos exponential method).

Checklist

  • I have checked that my code follows the Octopus coding standards
  • I have added tests for all the new features added in this request.
Edited by Micael Oliveira

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