I have been following the links below:
I find them helpful, but when I implement the method to my own system of ODE. I am generating wrong answers with the initial guesses I am using from a research manuscript I am following (the parameters used to refit the ode model does not match well with the exp data graphs). So I decided to randomly guess the initial parameter guess using rand. But the code takes over 2 hours to run, so I usually terminate it before the code actually finishes. I tried to use MultiStart to get better parameter initial guesses, but I am not sure if it is working. Am I doing something wrong with the code? Would it be best to use something else other than lsqcurvefit?
I have attached the excel file for the data and the code itself. Many thanks if this problem can be fixed, I have been stuck for weeks now!