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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”- v+ \' o) d- F% k
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x=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16];4 g' `* `7 o, _: X: B* Y6 [/ b
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];
8 }; J: w1 \. p, D' y% hy2=[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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' a( t7 b1 c9 ]8 N9 V, tfigure(1);9 u2 t" |4 n& z# Q2 n
%plot(x,y1,'r',x,y2,'b);/ z# y Q2 ^6 }" n( U% C
plot(x,y,'r');
" |3 L1 A. \' w. ttitle('线性拟合')
& C6 _9 Y0 q2 ~hold on;
+ [1 w( W4 X. m3 n! f! y[a,b]=Linear_fitting(x,y);& R9 j* ?5 A% L, @ v, u, \
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t=1:1:16;- b$ y9 c. o; w, X0 n2 Q; j
z=a*t+b;) l; r: m" }8 ?+ m+ f
plot(t,z);
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function [a,b]=Linear_fitting(x,y)1 `6 |7 L/ ]+ m
n=size(x,2);4 p! C( C0 J7 u% U8 G% |; E
sum_xy=sum(x.*y);6 I" e5 L& s- x4 f' V5 `
sum_x=sum(x);
. I: E4 I5 g& x" Hsum_y=sum(y);& A, P3 }. j1 O' n
sum_xx=sum(x.*x);6 l' ]$ |7 `! E, u; M
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a=(n*sum_xy-sum_x*sum_y)/(n*sum_xx-sum_x^2);9 Y$ P0 Z5 e; i j
b=(sum_xy-sum_xx*sum_y/sum_x)/(sum_x-n*sum_xx/sum_x);
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end
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发表于 2022-8-17 13:46
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