What is anterpolation, and how does it differ from interpolation? I cannot find a definition for the former, but I see it sometimes used (e.g. in the context of Fast Multipole Methods, like here).
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I found "performed by anterpolation, i.e., the adjoint of interpolation" and "anterpolation (transpose of interpolation)". Must be related somehow to multi-point evaluation. – Lutz Lehmann Feb 20 '17 at 08:09
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Using the comment of LutzL, I found that anterpolation (the adjoint of interpolation) is considered as a Scaling operator. I read that 2D-interpolation is described as the passage from a coarse mesh to a fine mesh and that 2D-anterpolation as the opposite, i.e. the transition from a fine mesh to a coarse mesh. Does it make sense in your context ? – keepAlive Feb 20 '17 at 13:28