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2022-1-29 15:07 |
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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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$ y( y; u- E" ?: Nx=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16];7 d# R: @' i2 h% ~0 ?8 u
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];& C6 w$ |$ M" o& n% ~0 n
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);. B7 Z" k4 [1 k! v
%plot(x,y1,'r',x,y2,'b);
6 q. N0 `+ c8 z% [plot(x,y,'r');
6 w4 [5 P3 B* H/ W) n' @ Xtitle('线性拟合')# {- b' W6 n+ C
hold on;
4 ~0 W" T) U8 J[a,b]=Linear_fitting(x,y);
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7 f1 F% x5 g. }8 ^" w! ]) F# O9 {9 ct=1:1:16;" A" c1 r; C7 b9 ]0 _3 A
z=a*t+b;* j$ h; W$ T P2 k/ i: q) C _
plot(t,z);
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function [a,b]=Linear_fitting(x,y)! O7 d) q2 m s( ] h0 a9 D
n=size(x,2);
8 j9 t: z) P& B- dsum_xy=sum(x.*y);1 H, B7 W5 m) i/ s/ V* w
sum_x=sum(x);
) ?4 \- ]# V& |3 Y7 Z. f2 {sum_y=sum(y);
: i' k, _7 U% A/ Esum_xx=sum(x.*x);
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a=(n*sum_xy-sum_x*sum_y)/(n*sum_xx-sum_x^2);
: C/ H3 d7 s: k3 S6 Pb=(sum_xy-sum_xx*sum_y/sum_x)/(sum_x-n*sum_xx/sum_x);
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3 D* D. D1 K: s( }* {end
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发表于 2022-8-17 13:46
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