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Table 2 Sparse multigrid algorithm

From: Sparse multidimensional modal analysis using a multigrid dictionary refinement

- Input. A signal y M, a matrix Φ M × N, a scaler λ and an integer L
- Output. A sparse coefficient vector xL-1 N
For l = 0 up to l = L - 1 x l = SAM ( Φ l , y , λ ) Φ l + 1 = ADAPT ( Φ l , x l ),
End For.