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”
! Z6 A. E( a& L# q' O1 w: N( V# M
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];
7 S, _: I$ l- k/ O1 }1 U0 v# q! ay2=[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];

& P+ C3 l, P+ c2 ?# _figure(1);
%plot(x,y1,'r',x,y2,'b);
plot(x,y,'r');
title('线性拟合')
hold on;
4 C/ S4 N9 V6 c) y9 d& J[a,b]=Linear_fitting(x,y);

t=1:1:16;
z=a*t+b;
  y7 H3 ~* p& s: e5 fplot(t,z);
3 R4 c$ B; h1 f$ B9 j7 P" [
0 z  h0 A) {& J2 Jfunction [a,b]=Linear_fitting(x,y)
n=size(x,2);
sum_xy=sum(x.*y);
sum_x=sum(x);
sum_y=sum(y);
sum_xx=sum(x.*x);

/ [6 o9 V4 t7 q+ Sa=(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);
; A7 R: y3 p. B; T$ z
7 U7 G0 }& Z5 D% [8 Zend

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_

/ a; b' T$ ?  i* e4 V# f

whatever_

你是要 这种效果吧？

拟合4次

  m; \, d) i4 c+ Z! m! K

拟合2次

测试例程

4 [. `: d+ F$ A/ j6 }4 N/ @; G