# Thread: Mathcad - system of ODEs with Minimize function

1. ## Mathcad - system of ODEs with Minimize function

Hello,

I’ve got a problem which I have to solve in Mathcad software. Here’s the description:

There is a system of ODEs and in these equations 2 constants are hidden. My task is to find the values of those constants in such a way that the solution of ODEs will mach experimental results.

I know how to solve differential equations via rkfixed command and others, but I have no idea how to connect this solution with the optimizing mathcad functions (Minimize). At this point I want to emphasize that this problem cannot be solved with Given Find procedure because there is no chance to calculate exact values which will match perfectly those from experiment.

Sorry for my English – if there is something that you don’t understand, please ask and I try to explain it better.

2. That is a difficult task, not knowing the equations or anything concerning your efforts.

3. The equations are not so important in this case. They are very complicated and they use many predefined earlier functions. I’ll give you a simple example of my problem: