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Results tagged with fourier-analysis
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user 122659
The representation of functions (or objects which are in some generalize the notion of function) as constant linear combinations of sines and cosines at integer multiples of a given frequency, as Fourier transforms or as Fourier integrals.
2
votes
Is it possible to use the Laplace Transform to calculate eigenvalues?
A very unsatisfying answer is matrix exponentiation (which is very expensive itself):
$$x_n=\exp(ihA)x_{n-1}$$
results in
$$
x_n^{(j)} = \exp(ih\lambda_jn) x_0^{(j)}
$$
and thus
$$
\|x_n\|^2 = \sum_{j …
- 385
4
votes
2
answers
547
views
Is it possible to use the Laplace Transform to calculate eigenvalues?
The relationship of Eigenvalues with Gradient Descent
Let $A$ be a symmetric (and thus diagonalizable) matrix, with diagonalization
$$A=VDV^T.$$
Let us define the quadratic function
$$f(x) = x^T A x.$ …
- 385