Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Computing the Discrete Fourier Transform of signals with spectral
  frequency support   We consider the problem of finding the Discrete Fourier Transform (DFT) of
$N-$ length signals with known frequency support of size $k$. When $N$ is a
power of 2 and the frequency support is a spectral set, we provide an $O(k \log
k)$ algorithm to compute the DFT. Our algorithm uses some recent
characterizations of spectral sets and is a generalization of the standard
radix-2 algorithm.

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The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: stat
8
The categories of this paper are: hep-ex
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The categories of this paper are: q-fin