P: Find(a, b, c, d) 2.833 P就是拟合的三次多项式的系数组成的矩阵 45.667 C(x)=P0x2+P1x2+P2x+P3做出拟合曲线的图形 The figure of C(x)and points C 作为进一步的练习,我们再来拟合一个四次多项式:数据点向量为: 02357 给定初始值 A:=0B:=0C:=0D:=0E:=0 Given +dx+e (x)+B()+C( 1)+D.x,+E= A()+B(3)2+c( +Dx、+E= A()+B(3)+c(y E )+B()3+c( m: Find(A, B, C, D, e)m := Find(A,B,C,D,E) A x 4 ( ) 4 × B x 4 ( ) 3 + × C x 4 ( ) 2 + × D x 4 + × + E y 4 = A x 3 ( ) 4 × B x 3 ( ) 3 + × C x 3 ( ) 2 + × D x 3 + × + E y 3 = A x 2 ( ) 4 × B x 2 ( ) 3 + × C x 2 ( ) 2 + × D x 2 + × + E y 2 = A x 1 ( ) 4 × B x 1 ( ) 3 + × C x 1 ( ) 2 + × D x 1 + × + E y 1 = A x 0 ( ) 4 × B x 0 ( ) 3 + × C x 0 ( ) 2 + × D x 0 + × + E y 0 = Given 给定初始值 A := 0 B := 0 C := 0 D := 0 E := 0 y j := 0.. 4 6 12 2 5 -1 æ ç ç ç ç ç è ö ÷ ÷ ÷ ÷ ÷ ø x := 0 2 3 5 7 æ ç ç ç ç ç è ö ÷ ÷ ÷ ÷ ÷ ø := 作为进一步的练习, 我们再来拟合一个四次多项式 :数据点向量为: 0 1 2 3 4 5 20 10 10 20 The figure of C(x) and points yi C(z) xi , z C(x) P 做出拟合曲线的图形. 0 x 3 × P 1 x 2 + × P 2 + ×x P 3 := + 令: P P就是拟合的三次多项式的系数组成的矩阵. 2.833 -20.5 45.667 -27 æ ç ç ç ç è ö ÷ ÷ ÷ ÷ ø = P := Find(a,b, c,d) 2