fouracc

package module

v0.7.0 Latest Latest Go to latest Published: Mar 29, 2023 License: BSD-3-Clause Imports: 14 Imported by: 0

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Valid go.mod file
Redistributable license
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Stable version
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Repository

github.com/lsst-lpc/fouracc

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Open Source Insights

README ¶

fouracc

fouracc is a simple Fourier analysis of acceleration data for the LSST testbench.

fouracc cmd

$> go get github.com/lsst-lpc/fouracc/cmd/fouracc
$> fouracc ./testdata/msr-accel-2019-08-06.csv 
fouracc: chunk size: 256
fouracc: file:       ./testdata/msr-accel-2019-08-06.csv
fouracc: data: 16384
fouracc: coeffs: 64
fouracc: dims: (c=64, r=128)

$> fouracc -chunks=128 ./testdata/msr-accel-2019-08-06.csv 
fouracc: chunk size: 128
fouracc: file:       ./testdata/msr-accel-2019-08-06.csv
fouracc: data: 16384
fouracc: coeffs: 128
fouracc: dims: (c=128, r=64)

fouracc-srv

fouracc also provides a web server that can run Fourier analyses over HTTP.

$> go get github.com/lsst-lpc/fouracc/cmd/fouracc-srv
$> fouracc-srv
fouracc-srv: http server listening on :8080
fouracc-srv: fname: msr-accel-2019-08-06.csv
fouracc-srv: chunks: 256
fouracc-srv: xs: 16384, 16384
fouracc-srv: coeffs: 64
fouracc-srv: dims: (c=64, r=128)
^Cfouracc-srv: shutdown sequence...

srv

Documentation ¶

Overview ¶

Package fouracc provides a function to analyze a time series by chunks.

Index ¶

func Load(r io.Reader) (xs, ys []float64, err error)
func Plot(dc draw.Canvas, fft FFT) error
type FFT
- func ChunkedFFT(fname string, chunksz int, xs, ys []float64, freq float64) FFT

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func Load ¶

func Load(r io.Reader) (xs, ys []float64, err error)

Load reads data from the provided io.Reader. Load expects 1 or 2 columns of the form ([time series], amplitudes).

func Plot ¶

func Plot(dc draw.Canvas, fft FFT) error

Plot plots the provided FFT on the provided canvas.

Types ¶

type FFT ¶

type FFT struct {
	Data struct {
		X []float64
		Y []float64
	}
	Ts     []float64   // chunked time series
	Freqs  []float64   // frequencies
	Coeffs [][]float64 // FFT coefficients

	Name   string
	Chunks int
	Scale  float64 // Frequency scale
}

func ChunkedFFT ¶

func ChunkedFFT(fname string, chunksz int, xs, ys []float64, freq float64) FFT

func (FFT) Dims ¶

func (fft FFT) Dims() (c, r int)

func (FFT) X ¶

func (fft FFT) X(c int) float64

func (FFT) Y ¶

func (fft FFT) Y(r int) float64

func (FFT) Z ¶

func (fft FFT) Z(c, r int) float64

Source Files ¶

View all Source files

Directories ¶

Path	Synopsis
cmd
fouracc command Command fouracc runs a FFT analysis on an MSR acceleration file.	Command fouracc runs a FFT analysis on an MSR acceleration file.
fouracc-srv command Command fouracc-srv runs a web server for the FFT analysis on an MSR acceleration file.	Command fouracc-srv runs a web server for the FFT analysis on an MSR acceleration file.
msr Package msr parses CSV files directly produced by MSR acceleration sensors.	Package msr parses CSV files directly produced by MSR acceleration sensors.

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