fixed dependencies

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nuknal
2024-10-24 15:46:01 +08:00
parent d16a5bd9c0
commit 1161e8d054
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vendor/github.com/nuknal/goNum/FittingLSQ.go generated vendored Normal file
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// FittingLSQ
/*
------------------------------------------------------
作者 : Black Ghost
日期 : 2018-12-23
版本 : 0.0.0
------------------------------------------------------
线性最小二乘拟合
理论:
设对N个数据对的线性拟合表示为
y = Ax + B
N N N
A*Sum xi^2 + B*Sum xi = Sum xiyi
i=1 i=1 i=1
N N
A*Sum xi + NB = Sum yi
i=1 i=1
解此二元线性方程组即可得A、B
参考John H. Mathews and Kurtis D. Fink. Numerical
methods using MATLAB, 4th ed. Pearson
Education, 2004. ss 5.1
------------------------------------------------------
输入 :
XY 数据对nx2x-y
输出 :
sol 解2x1
err 解出标志false-未解出或达到边界;
true-全部解出
------------------------------------------------------
*/
package goNum
// FittingLSQ 线性最小二乘拟合
func FittingLSQ(XY Matrix) (Matrix, bool) {
/*
线性最小二乘拟合
输入 :
XY 数据对nx2x-y
输出 :
sol 解2x1
err 解出标志false-未解出或达到边界;
true-全部解出
*/
//判断XY的维数
if XY.Columns < 2 {
panic("Error in goNum.FittingLSQ: At least 2 columns of XY needed")
}
sol := ZeroMatrix(2, 1)
AS := ZeroMatrix(2, 2)
BS := ZeroMatrix(2, 1)
var err bool = false
var sx2, sx, sxy, sy float64
n := XY.Rows
//求累加和
for i := 0; i < n; i++ {
sx2 += XY.GetFromMatrix(i, 0) * XY.GetFromMatrix(i, 0)
sx += XY.GetFromMatrix(i, 0)
sxy += XY.GetFromMatrix(i, 0) * XY.GetFromMatrix(i, 1)
sy += XY.GetFromMatrix(i, 1)
}
AS.SetMatrix(0, 0, sx2)
AS.SetMatrix(0, 1, sx)
AS.SetMatrix(1, 0, sx)
AS.SetMatrix(1, 1, float64(n))
BS.SetMatrix(0, 0, sxy)
BS.SetMatrix(1, 0, sy)
//解二元线性方程组
soltemp, errtemp := LEs_ECPE(Matrix2ToSlices(AS), Matrix1ToSlices(BS))
if errtemp != true {
panic("Error in goNum.FittingLSQ: Solve error")
}
sol.SetMatrix(0, 0, soltemp[1])
sol.SetMatrix(1, 0, soltemp[0])
err = true
return sol, err
}