MATLAB线性拟合问题

elephant_

怎么把两个线拟合到一个图里，然后显示y轴标题为“电阻值”，x轴标题为“个数”

x=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16];
y1=[2.23,2.53,4.52,3.01,2.75,3.86,2.25,2.39,0.19,2.62,-4.68,-4.76,-10.75,-7.84,-5.25,-9.96];
$ V/ C& T' w' m5 N; c0 Yy2=[2.37,2.53,3.91,3.01,2.75,3.86,2.25,2.39,0.19,2.62,1.07,-4.76,-10.75,-7.84,-5.25,-9.96];

- n  R9 o; ?5 T/ d5 u1 `figure(1);
%plot(x,y1,'r',x,y2,'b);
plot(x,y,'r');
title('线性拟合')
hold on;
. [: D" [' o1 s! i: O- I8 c1 W0 H[a,b]=Linear_fitting(x,y);
! n" s. \* |, n. s* }; k
t=1:1:16;
5 P! Q  u$ [# k4 oz=a*t+b;
  z& `( N5 z9 E/ L/ Y( F$ fplot(t,z);

0 g9 M7 _; e8 m! |  s. ?1 [function [a,b]=Linear_fitting(x,y)
3 c) f  p  L% Q3 O2 Bn=size(x,2);
+ W: i. ]3 S2 o' p2 F7 C# }sum_xy=sum(x.*y);
# ^2 Q8 G* m' Y2 M' I% J7 ?5 Gsum_x=sum(x);
sum_y=sum(y);
  h) `& T( R; M# d8 I: Hsum_xx=sum(x.*x);
4 F5 L/ x7 X0 h9 H, r- u
a=(n*sum_xy-sum_x*sum_y)/(n*sum_xx-sum_x^2);
b=(sum_xy-sum_xx*sum_y/sum_x)/(sum_x-n*sum_xx/sum_x);
3 |7 C- f; m' m, J: Z% i0 D$ y( f
end
' h" h+ p  e$ R

purpose_857

能否先给出一个你认为已达成目的的图呢，它长什么样子。

elephant_

( u: r, x) \2 u, D) c

whatever_

你是要 这种效果吧？

拟合4次

拟合2次

- Y& @* O& x. I, z+ ^5 k( k0 ]

测试例程

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