MATLAB: Solving a variable from a set of equations.

equationequation solver

Hi there, I have got a code currently that's used to create a nlinfit from experimental results. I also have a code which can give me the simulation results. What I want to do is use the curve from experimental data and solve for a variable in the simulation results to give the same results.

Best Answer

It seems you want to know how to use the results of nlinfit to simulate your objective function. To do this, substitute the estimated parameters into your function to get the results.
For example:
f = @(b,x) b(1) + b(2).*exp(b(3).*x);           % Objective Function
x = linspace(0, 10, 25);                        % Create Data

y = f([7; 5; -3], x) + 0.1*randn(size(x));      % Create Data
B = nlinfit(x, y, f, [1; 1; -1]);               % Estimate Parameters
figure(1)
plot(x, y, 'bp')                                % Plot Data
hold on
plot(x, f(B,x), '-g')                           % Substitute Estimated Parameters, Plot
hold off
grid
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