Graph Signal Processing, Fourier Transform, Graph Fourier Transform, Eigenvectors, Spectral Analysis.
try to view this matrix as the adjacency/weight matrix of a graph Gc. Graph Here, V is the set of vertices and E the edges. V will have N number of nodes. The n-th row in Ac will represent the edges ending on the n-th vertex. The graph that has its adjacency matrix as Ac will look like the