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The Full Multigrid (FMG) algorithm works with grids of different sizes corresponding to different levels through the relation size = 2^level + 1, where size is the number of grid elements in one dimension. Interpolation is the process of taking a function whose value is known at the grid elements of a grid at a certain level (the coarse grid) and producing the values of the function at the grid elements of a grid at the next finer level (the fine grid). The fine grid and the coarse grid are oriented such that their corner elements coincide.
public abstract BoundaryGrid interpolate(ConstBoundaryGrid grid)
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