Attempting to get a line of best fit for a custom function

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Naveed Hossain
Naveed Hossain 2018-9-9
回答： Walter Roberson 2018-9-9
I am trying to get a line of best fit for a custom function. Here is my code and the plot that it produces. The problem is that the line seems to be touching every point, which is not what I want. Any suggestions? Also I understand that I can use the curve fitting app, but I prefer doing this by writing up a code
clc;
x(1,:) = Y1;
x(2,:) = Dmge;
plot(x(1,:),x(2,:),'.');
A= 5500; B=0.19; C=2.3;
goemp_fit1 = @(y)sum((y(1)*exp(-exp(-y(2)*(x(1,:)-y(3))))-x(2,:)).^2);
coeff = fminsearch(goemp_fit1,[A B C]);
A = coeff(1);
B = coeff(2);
C = coeff(3);
x2 = x(1,:);
y2 = A*exp(-exp(-B*(x-C)));
plot(x2,y2,'-m')

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Walter Roberson
Walter Roberson 2018-9-9
x2 = x(1,:);
that is one row and multiple columns
y2 = A*exp(-exp(-B*(x-C)));
that involves all of x, so it involves two rows and multiple columns. Perhaps you should be using
y2 = A*exp(-exp(-B*(x2-C)));

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