How should i Implement a function that fits a line using least squares to the 2-D data points. It should output the two parameters of a line without using a toolbox for fitting the line. And i have to do this by doing regression

I need to plot the points and the line obtained from the function. Can somebody help me writing the code?

Answer 1

[John BG]

the function polyfit(x,y,n) does what you need.

The MATLAB starter help example with n=1

x = linspace(0,1,5);
y = 1./(1+x);

p = polyfit(x,y,1);
x1 = linspace(0,2);
y1 = 1./(1+x1);
f1 = polyval(p,x1);
figure
plot(x,y,'o')
hold on
plot(x1,y1)
plot(x1,f1,'r--')
legend('y','y1','f1')

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thanks in advance

John

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[max]

so x and y with be my input points?