ssa

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package oss
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import (
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	"math"
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	"strconv"
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	"github.com/xuri/excelize/v2"
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)
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func Make_singnal(n int) []float64 {
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	waveform := make([]float64, n)
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	for index := range waveform {
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		waveform[index] = F(float64(index), n)
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		//waveform[index] += math.Cos(2 * math.Pi * 0.03 * float64(index))
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		//waveform[index] += 0.8 * math.Cos(2*math.Pi*(0.06*float64(index)+0.09/(2.0*float64(n))*float64(index)*float64(index)))
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	}
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	return waveform
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}
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func Make_singnal_xn(filename string) ([]float64, int) {
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	f, _ := excelize.OpenFile(filename + ".xlsx")
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	cells, _ := f.GetRows("main")
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	a := make([]float64, len(cells))
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	for i := 0; i < len(cells); i++ {
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		b, _ := strconv.ParseFloat(cells[i][0], 64)
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		a[i] = b
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	}
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	return a, len(cells)
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}
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func F(x float64, n int) float64 {
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	var waveX float64
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	waveX = math.Cos(2 * math.Pi * 0.03 * x)
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	waveX += 0.8 * math.Cos(2*math.Pi*(0.06*x+0.09/(2.0*float64(n))*x*x))
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	return waveX
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}
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