myfun = @(x,xdata) x(1)*exp(x(2)*xdata);
% Assume you determined xdata and ydata experimentally
xdata = [0.9 1.5 13.8 19.8 24.1 28.2 35.2 60.3 74.6 81.3];
ydata = [455.2 428.6 124.1 67.3 43.2 28.1 13.1 -0.4 -1.3 -1.5];
x0 = [100; -1];
[x] = lsqcurvefit(myfun,x0,xdata,ydata);
Local minimum possible.
lsqcurvefit stopped because the final change in the sum of squares relative to its initial value is less than the default value of the function tolerance.
stopping criteria details
x
x =
498.83
-0.10126
myfun(x,xdata)
ans =
Columns 1 through 7
455.38 428.54 123.34 67.18 43.466 28.698 14.126
Columns 8 through 10
1.1124 0.26145 0.13267
Works for me. Do you have another function 'myfun' somewhere?
