I have a set of data and I need to fit it to the curve F(x,xdata) and then find the values of five unknown coefficients .
a,b,c,d and e are the five coefficients which are replaced by x(0) , x(1) , x(2), x(3), x(4) and x(5) in the code below.
Running this code produces an error message. But when I removed "xdata" which was originally multiplied to the sqaured expression in the later part of the function, I got an output containing the values of the coefficients I needed.
How do i get an ouput while not having to remove "xdata" from the later part of the function?
clc;
Data = ...
[-0.02 2000
0 1650
0.03 1300
0.06 1050
0.09 880
0.12 700
0.15 550
0.18 400
0.21 240
0.24 120
0.27 0 ];
k = Data(:,1);
y = Data(:,2);
F = @(x,xdata)6*(x(1)*exp(-xdata*x(2))-x(3))*(2*(1-xdata*(x(4)*exp(-100000)-x(5)))^2-1);
plot(k,y,'r');
x0 = [1 1 1 1 1];
[x] = lsqcurvefit(F,x0,k,y)
