I'm trying to do the polynomial curve-fitting part of this pdf (attached). I'm having trouble calculating the coefficients. I get no 0th order coefficient. I'm also having a lot of trouble with the ' \ ' operator because even when the length of v and A match up (or should do) it says the matrix size is wrong.
This is my code
Thanks so much. I'm desperate.Code:function = C002v2_2() start = 0; fin = 200; n = 100; div = (fin - start)/n; c1 = [1.5, -2.5, 0.7, -1.2]; e = 0.01; x = startfin; y = x; for i = 1:n y(i) = c1(1) + c1(2) * x(i) + c1(3) * x(i)^2 + c1(4) * x(i)^3 + e * randn(); end v = zeros(4,1); for k = 1:4 for i = 1:n v(k) = v(k) + y(i)*x(i)^k; end end A = zeros(4, 3); for k = 1:4 for i = 1:3 for j = 1:n A(k,i) = A(k,i) + x(j)^(i+k); end end end %A %v c2 = A \ v; %c2 yf = c2(1) + c2(2) * x + c2(3) * x.^2 + c2(4) * x.^3; f = figure(); plot(x, y, x, yf); end
matlab, please help
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