47 lines
1.0 KiB
Go
47 lines
1.0 KiB
Go
package main
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import (
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"fmt"
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"github.com/skelterjohn/go.matrix"
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)
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func givens() (x, y *matrix.DenseMatrix) {
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height := []float64{1.47, 1.50, 1.52, 1.55, 1.57, 1.60, 1.63,
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1.65, 1.68, 1.70, 1.73, 1.75, 1.78, 1.80, 1.83}
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weight := []float64{52.21, 53.12, 54.48, 55.84, 57.20, 58.57, 59.93,
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61.29, 63.11, 64.47, 66.28, 68.10, 69.92, 72.19, 74.46}
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m := len(height)
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n := 3
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y = matrix.MakeDenseMatrix(weight, m, 1)
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x = matrix.Zeros(m, n)
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for i := 0; i < m; i++ {
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ip := float64(1)
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for j := 0; j < n; j++ {
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x.Set(i, j, ip)
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ip *= height[i]
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}
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}
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return
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}
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func main() {
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x, y := givens()
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n := x.Cols()
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q, r := x.QR()
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qty, err := q.Transpose().Times(y)
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if err != nil {
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fmt.Println(err)
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return
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}
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c := make([]float64, n)
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for i := n - 1; i >= 0; i-- {
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c[i] = qty.Get(i, 0)
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for j := i + 1; j < n; j++ {
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c[i] -= c[j] * r.Get(i, j)
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}
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c[i] /= r.Get(i, i)
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}
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fmt.Println(c)
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}
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