nonlinear regression considering substrate addition over time

Hi all, I'm trying to generate some code why insert model in my data. The problem is that I have a substrate addition in 3 different periods, which I have split into three tspans.I thought it was simple enough, but some problems appeared that I don't know how to fix. I attach both the code and the data txt file.

Thanks everyone in advance!!

Answer 1

[Varun]

Hi Jack95,

I understand that you are facing errors while running your script test.m which uses ode45() function.

I have run your script test.m with data.txt locally, I also faced the errors. I figured out the root cause of error. Actually inside your custom function function

dCdt=ParameterJack(t,C)

you are calling

[T,Cv]=ode45(@DifEq,t,c0);

in which the 2nd argument to ode45 expects a tspan and should have at least 2 elements (e.g. a vector) but you are passing ‘t’ as argument which is a scalar. I tried passing some dummy vector with at least 2 elements and the error was resolved.