manually. Google Sheets is the new name for Google Docs Spreadsheets <https://www.google.com/sheets/about>.

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person("Julius O.", "Smith III", role = "ctb"),
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Description: R implementation of the 'Octave' package 'signal', containing
a variety of signal processing tools, such as signal generation and
measurement, correlation and convolution, filtering, filter design,
filter analysis and conversion, power spectrum analysis, system
identification, decimation and sample rate change, and windowing.
Suggests: knitr, rmarkdown, testthat, ggplot2, gridExtra,
Author: Geert van Boxtel [aut, cre] (Maintainer),
Tom Short [aut] (Author of 'signal' package),
Paul Kienzle [aut] (Majority of the original sources),
Maintainer: Geert van Boxtel <G.J.M.vanBoxtel@gmail.com>