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Table 3 R-D sparse multigrid algorithm

From: Sparse multidimensional modal analysis using a multigrid dictionary refinement

- Input. A signal y M 1 M 2 . . . M R R matrices Φ 0 ( r ) M r × N r , a scaler λ and an integer L
- Output. A sparse coefficient vector xL-1 N
For l = 0 up to l = L - 1 Φ l = Φ l ( 1 ) Φ l ( 2 ) Φ l ( R ) x l = SAM( Φ l ,y, λ )
For r = 1 up to r = R Φ l + 1 ( r ) = ADAPT( Φ l ( r ) , x l )
   End For
End For.