Opening for discussion. This helps to work around a bug when injecting to more complex fields such as f(t, u(x,y,z)). Helps to implement Listing 3 of https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9460483

Codecov Report

Merging #1817 (8f7d9c2) into master (8ea8d45) will decrease coverage by 25.09%. The diff coverage is 61.53%.

@@             Coverage Diff             @@
##           master    #1817       +/-   ##
===========================================
- Coverage   87.77%   62.68%   -25.10%     
===========================================
  Files         214      140       -74     
  Lines       36984    20604    -16380     
  Branches     5570     3702     -1868     
===========================================
- Hits        32464    12916    -19548     
- Misses       4001     7037     +3036     
- Partials      519      651      +132     

Impacted Files	Coverage Δ
devito/types/sparse.py	31.54% <16.66%> (-56.41%)	:arrow_down:
devito/operations/interpolators.py	71.25% <100.00%> (-27.54%)	:arrow_down:
devito/builtins/arithmetic.py	16.04% <0.00%> (-81.60%)	:arrow_down:
devito/builtins/initializers.py	11.02% <0.00%> (-80.89%)	:arrow_down:
devito/core/autotuning.py	13.00% <0.00%> (-80.75%)	:arrow_down:
devito/passes/iet/languages/utils.py	20.00% <0.00%> (-80.00%)	:arrow_down:
devito/passes/clusters/buffering.py	13.86% <0.00%> (-79.75%)	:arrow_down:
devito/finite_differences/coefficients.py	18.26% <0.00%> (-74.43%)	:arrow_down:
devito/mpi/routines.py	25.84% <0.00%> (-69.67%)	:arrow_down:
devito/data/utils.py	22.17% <0.00%> (-66.95%)	:arrow_down:
... and 173 more

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I cannot access the paper. Can you paste/rewrite the snippet here?

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Helps to implement Listing 3 of https://arxiv.org/pdf/2010.10248.pdf

Pushed branch to georgebisbas/devito.