Mathematica 9 is now available
Student Support Forum
-----
Student Support Forum: 'Diff. equation w/ interpolated function won't w...' topicStudent Support Forum > General > Archives > "Diff. equation w/ interpolated function won't w..."

Help | Reply To Topic
Author Comment/Response
Daniel
10/20/11 7:49pm

Dear all,

I'm working on a project that involves a solid particle passing a supersonic shock. I'm trying to find the temporal response of the temperature numerically.

It all comes down to a final DE of the form: T'(t)=f(t)*T(t)

f(t) is a function that I retrieve from interpolating between several functions fitted through measurement points.

Evaluating the code returns the following error: NDSolve::ndnum: Encountered non-numerical value for a derivative at t == 0.`. >>
When I replace f(t) with a more simple function it works without issues. (Hint: the actual f(t) function is defined and non-zero for every t!)

Can someone spot what I'm missing here?

Attached you will find the complete notbeook. The interesting part is the last two cells: first one will result in an error, second one will work.

Thanks,
Daniel

Attachment: forum.nb, URL: ,
Help | Reply To Topic