20251117

2025-11-17 11:16:02 +08:00
parent 4bd2d87fc4
commit 1b3b07a7f6
35 changed files with 454 additions and 0 deletions
@@ -0,0 +1,16 @@
+x=1:10;
+y=[4.9,3.3,4.2,4.2,5.7,6.5,7.7,9.4,14.7,19.0];
+a=polyfit(x,y,2);
+b=polyfit(x,y,3);
+c=polyfit(x,y,4);
+xx=1:0.1:10;
+yy1=polyval(a,xx);
+yy2=polyval(b,xx);
+yy3=polyval(c,xx);
+plot(x,y,'*b')
+hold on
+plot(xx,yy1,'-r',xx,yy2,'-g',xx,yy3,'-y')
+title('2,3,4次曲线拟合')
+xlabel('变量x')
+ylabel('变量y')
+legend('y','yy1','yy2','yy3')