Contents
Eri asteisia pienimmän neliösumman (PNS) sovituksia
clear all; close all
xdata=[-1 -0.960 -0.86 -0.79 0.22 0.5 0.93];
ydata= [ -1 -0.151 0.894 0.986 0.895 0.5 -0.306];
plot(xdata,ydata,'o')
a=min(xdata)-0.1;b=max(xdata)+0.1;
c=min(ydata)-0.1;d=max(ydata)+0.1;
axis([a b c d])
c1=polyfit(xdata,ydata,1);
c2=polyfit(xdata,ydata,2);
c3=polyfit(xdata,ydata,3);
c4=polyfit(xdata,ydata,4);
x=linspace(a,b);
y1=polyval(c1,x);
y2=polyval(c2,x);
y3=polyval(c3,x);
y4=polyval(c4,x);
hold on
plot(x,y1,'r',x,y2,'b',x,y3,'k',x,y4,'g')
ylim([-1.1 3])
grid on
legend('Data','PNS-suora','PNS 2','PNS 3','PNS 4')