Add linearity tests for forward models#698
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Test that the field generated by a set of sources equals the sum of the fields of each source computed separately. Covers point_gravity (Cartesian and spherical), dipole_magnetic, prism_gravity, prism_magnetic and tesseroid_gravity, parametrized by field.
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Fixes #293
Adds
test/test_linearity.pywith linearity tests for each geometry (points, prisms, tesseroids), parametrized by field, following the discussion in the issue: the field of a set of sources is compared against the sum of the fields of each source computed separately.Includes both gravity and magnetic forward models:
point_gravity(Cartesian and spherical coordinates),dipole_magnetic,prism_gravity,prism_magneticandtesseroid_gravity, using mixed-sign masses/densities/magnetizations.The newer
ellipsoid_gravity/ellipsoid_magneticforwards could get the same treatment in a follow-up if you'd like.