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”

" n0 C  S0 ^' U' D# L1 Gx=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16];
. o: S; w" o0 K0 T7 oy1=[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];
. A( C. l1 Y% S4 Ky2=[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);
# U1 M$ S: S2 N1 M/ e%plot(x,y1,'r',x,y2,'b);
plot(x,y,'r');
title('线性拟合')
hold on;
[a,b]=Linear_fitting(x,y);

. s) r' j# a( h* Q7 \( it=1:1:16;
+ Y* B( h1 N+ Wz=a*t+b;
plot(t,z);

function [a,b]=Linear_fitting(x,y)
n=size(x,2);
% J6 w* t- O7 Q: Qsum_xy=sum(x.*y);
sum_x=sum(x);
% U1 A  ?1 \# {1 msum_y=sum(y);
" F: A, g: w+ K1 k2 isum_xx=sum(x.*x);

. r8 u5 W3 Y! o5 V* V4 @+ v$ W. ja=(n*sum_xy-sum_x*sum_y)/(n*sum_xx-sum_x^2);
+ @  n2 o0 @( X" k6 [5 Y: ~. Bb=(sum_xy-sum_xx*sum_y/sum_x)/(sum_x-n*sum_xx/sum_x);

end
$ }) n. M6 _( Q' i4 W

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_

whatever_

你是要 这种效果吧？

拟合4次

/ a0 N/ `9 Q( _6 H% D+ t; l/ {
$ J+ m7 {& E* B$ g* O8 @

拟合2次

测试例程

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