Fourier

• New routine:

  • emg3d.utils.Fourier, a class to handle Fourier-transform related stuff for time-domain modelling. See the example notebooks for its usage.

• Utilities:

  • Fields and returned receiver-arrays (EMArray) both have amplitude (.amp) and phase (.pha) attributes.
  • Fields have attributes containing frequency-information (freq, smu0).
  • New class SourceField; a subclass of Field, adding vector and v{x,y,z} attributes for the real valued source vectors.
  • The Model is not frequency-dependent any longer and does NOT take a freq-parameter any more (currently it still takes it, but it is deprecated and will be removed in the future).
  • data_write automatically removes _vol from TensorMesh instances and _eta_{x,y,z}, _zeta from Model instances. This makes the archives smaller, and they are not required, as they are simply reconstructed if needed.

• Internal changes:

  • The multigrid method, as implemented, only works for the diffusive approximation. Nevertheless, we always used \sigma-i\omega\epsilon, hence a complex number. This is now changed and \epsilon set to 0,
    leaving only \sigma.
  • Change time convention from exp(-iwt) to exp(iwt), as used in empymod and commonly in CSEM. Removed the parameter conjugate from the solver, to simplify.
  • Change own private class variables from __ to _.
  • res and mu_r are now checked to ensure they are >0; freq is checked to ensure !=0.

• New dependencies and maintenance:

  • empymod is a new dependency.
  • Travis now checks all the url's in the documentation, so there should be no
    broken links down the road. (Check is allowed to fail, it is visual QC.)

• Bugfixes:

  • Fixes to the setuptools_scm-implementation (MANIFEST.in).