Hello everyone, I am going to parametrize solving block (odesolve func) and then define corresponding coefficients by least square. But unfortunately, I meet problem after parametrization of the solve block. Could someone help me with this? Thank you in advance. You can find example of the program attached
Thank you very much, it works geat. The last question is about few differential equations. I need to solve a system of diff equations but fit them by the data for only one of the main variables. For example:
We have system p' (t) = a*p -B*p^2 and n' (t) = a*n; with some init cond p(0)=0 and n(0)=1; So I need fit this system by some data from p1 = [10,20,30,40] , t1= [0,1,2,3]. How it is better to do this .
I am trying to find parameters of the set of differential equations. So, I solve st of dif equations by Odesolve (see attacehed) and then trying to minner coefficients a and Nt1 using experimental data Con and t11. The system must at least work, but I have error at Minerr step. Could someone help me with this? Thank you, very much.
Thank you, it works now. I went further and meet the next problem.
Minerr function calculates coefficients , but they are negetive some time. How can I give additional condition where all the coefficients must be a positive value. Sorry for obstruction, it look like the last problem which I need to solve.
Can I use the following (see attached) consistent Equality conditions constructions to fin 2 data sets Con1(I1) and R1(I1) by the same parameters.
I am solve set of equations and get n(I1) and p(I1) , so then I compare p(I1)*e*60=Con1(I1) and (p(I1)*60^2-n(I1)*925^2)/e*(p(I1)*60+n(I1)*925)^2 = R1.
I found out that if I delete the firstEquality condition fit does not change. So this can mean that I use wrong Mathcad syntax. Unfortunately, I did not find some similar programs.
