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”
$ P$ i+ f/ f$ [. y
* _  b9 a" G" w/ M, Vx=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16];
+ j) d+ \# n! D: E7 Z& ]8 wy1=[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];
# M# K$ P+ M# Z( ]- Py2=[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];

figure(1);
%plot(x,y1,'r',x,y2,'b);
plot(x,y,'r');
0 Z8 G- d2 s  gtitle('线性拟合')
hold on;
; A! y3 W7 k. L# ?  s( A$ f[a,b]=Linear_fitting(x,y);

) A4 ]) ]( n9 B% ?t=1:1:16;
z=a*t+b;
plot(t,z);

3 z' B: K' m  }% |function [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);
. T' a6 ]0 w/ j9 b% k& R
7 M' e1 i" S: x7 d5 ]& ga=(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);
9 Q( i8 Y& g9 }$ I
; }5 P8 @* P: ]' y  B; V/ _: [* Eend

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_

8 \$ V% s- }1 d/ f: n( X

whatever_

你是要 这种效果吧？

拟合4次

# h& `6 i" _' H" l0 v

拟合2次

9 ]: |7 m6 `* z6 e0 R

测试例程

5 f' t; n; A! z  w