- #1
Vrbic
- 407
- 18
I have a problem to understand some parts of numerical recipe for runge-kutta. I can made it by myself but I am very curious how they do that:
Here are my questions:
1) Why "call derivs" is not in DO routine? What is only "yt"? I would expect "yt(i)".
2) How does subroutine "derivs" look like?? How can I make derivative of "yt"? It is one value. I don't know value in further points so how can I derive it?
Thank you for help.
Here are my questions:
1) Why "call derivs" is not in DO routine? What is only "yt"? I would expect "yt(i)".
2) How does subroutine "derivs" look like?? How can I make derivative of "yt"? It is one value. I don't know value in further points so how can I derive it?
Thank you for help.