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p2: make autocorrelation always positive

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This commit is contained in:
leo 2023-02-27 01:36:36 +01:00
parent c9834c4059
commit 8c99960c35
Signed by: wanderer
SSH Key Fingerprint: SHA256:Dp8+iwKHSlrMEHzE3bJnPng70I7LEsa3IJXRH/U+idQ
4 changed files with 31 additions and 31 deletions
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34
p2/data/autocorrelation_u.csv
View File

@ -1,26 +1,26 @@
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20
p2/data/autocorrelation_y.csv
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4
p2/stats/stats.go
View File

@ -33,7 +33,7 @@ func Autocorrelate(f []float64, maxShift float64) []float64 {
r *= 1 / float64(fLen-currentShift)
v = append(v, r)
v = append(v, math.Abs(r))
currentShift++
}
@ -56,7 +56,7 @@ func AutocorrelateMP(f []float64, maxShift float64) []float64 {
r *= math.Pow(float64(fLen-currentShift), -1)
v = append(v, r)
v = append(v, math.Abs(r))
currentShift++
}

4
p2/stats/stats_test.go
View File

@ -13,13 +13,13 @@ func TestAutocorrelate(t *testing.T) {
desc: "autocorrelate a 10-long slice",
maxShift: .1,
in: []float64{.4, .5, .23, 2.5, -3.6, .4, -0.12, 2.2, 0.02, 14.4},
out: []float64{23.204770000000003, -1.0588888888888885},
out: []float64{23.204770000000003, 1.0588888888888885},
},
{
desc: "autocorrelate a 20-long slice",
maxShift: .1,
in: []float64{.4, .5, .23, 2.5, -3.6, .4, -0.12, 2.2, 0.02, 14.4, .4, .5, .23, 2.5, -3.6, .4, -0.12, 2.2, 0.02, 14.4},
out: []float64{23.204770000000003, -0.6999999999999996, 4.234177777777778},
out: []float64{23.204770000000003, 0.6999999999999996, 4.234177777777778},
},
}