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”
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; H- g; W3 E: R$ Z9 J% H4 R" Zx=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16];
4 ^5 d9 b5 h/ Sy1=[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];
y2=[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];
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figure(1);
%plot(x,y1,'r',x,y2,'b);
plot(x,y,'r');
title('线性拟合')
  n- _, v; D) p! O( |  i! W2 Ahold on;
; |1 R9 X. r# B) m0 Z  p[a,b]=Linear_fitting(x,y);
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t=1:1:16;
z=a*t+b;
$ B0 \& Z( |* }plot(t,z);
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5 g! j6 P6 e# l" `3 m5 vfunction [a,b]=Linear_fitting(x,y)
6 |8 o3 ^7 J( cn=size(x,2);
sum_xy=sum(x.*y);
sum_x=sum(x);
% S# J' O4 S" K* m$ k+ _sum_y=sum(y);
sum_xx=sum(x.*x);

a=(n*sum_xy-sum_x*sum_y)/(n*sum_xx-sum_x^2);
% }5 R4 h3 v1 W+ W* gb=(sum_xy-sum_xx*sum_y/sum_x)/(sum_x-n*sum_xx/sum_x);
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end

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_

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whatever_

你是要 这种效果吧？

拟合4次

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拟合2次

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测试例程

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