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fgörlich1-Visitor
1-Visitor
May 10, 2017
Question

Component Derivate for a DGL-System

  • May 10, 2017
  • 1 reply
  • 2516 views

Hi guys,

I have a quastion. I give you an minimal example. I want to solve a ODE-system with the Radau-Solver. Therefore I need to build the derivate B to component X_2. In the picture you can see, that i can write only X. How can i build this derivate? I know the derivate ist X_1+X_2, but in my real problem i have a big equation-system with many function in another function. So i need a practical solution like  d/dX_2(X_1+X_0*X_2). Can someone help me?

1 reply

A
AlanStevens19-Tanzanite
19-Tanzanite
May 10, 2017

Here's a possible solution - done in M15, but should work in Prime (I think!}.

DGL.PNG

Unfortunately, when entering B in D it seems you have to list the elements of X explicitly - it doesn't work if you just enter B(X).

Alan

F
fgörlich1-VisitorAuthor
1-Visitor
May 10, 2017

How do you write the red z symbol?

F
fgörlich1-VisitorAuthor
1-Visitor
May 10, 2017

I think it is a Mathcad Prime problem. It looks likes

The derivate it wrong

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