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Xavier Andrade edited Theory.tex
over 9 years ago
Commit id: 73d532147f29cc740ace1ef5aa6468573bad7637
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different basis.
Suppose we wish to recover an \(N \times N\) matrix \(A\) known to be sparse in a particular orthonormal basis $\{\psi_i\}$(for simplicity we restrict ourselves to square matrices an orthonormal bases). Without no prior knowledge of where the \(S\) non-zero
entries of \(A\) are located, to recover the matrix we need to calculate all
$\{\phi_i\}$. the elements of of the matrix.
\(\{\phi_i\}\). The matrices \(A\) and \(B\) are related according to
the change-of-basis formula
\begin{align}
\label{eq:cob_matrix}