From: Sparse multidimensional modal analysis using a multigrid dictionary refinement
- Input. A signal y∈ ℂM, a matrix Φ ∈ ℂM × Nand a scalar λ - Output. A sparse coefficient vector x∈ ℂN. |
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1. Initialize. Set the index set Ω1 = ∅, The coefficient vector x1 = [0,..., 0]Tand set the counter to k = 1. 2. Identify. Find the replacement nk of Φ that most decreases the objective function: 3. Iterate. Update the active set if Increment k. Repeat (2)-(3) until the active set is not updated. 4. Output. Return x = x k , the active amplitudes. |