It is a technique for converting a signal into elementary frequency components. Discrete cosine transform (DCT) is the basis of many image compression methods.Poisson Equation Solvers It can be extended to 2D or 3D T N, T NxN, T NxNxN are symmetric banded matrices Direct methods to solve linear systems: O(N3) time impossible for 2D or 3D cases Need iterative methods Please refer to previous lectures on linear algebra and banded matrices. MATLAB's backslash versus V-cycle multigrid method.
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