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Nov 13, 2017
12:06 PM

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Nov 13, 2017
12:06 PM

Rkfixed Solver

Updated question from a few weeks ago. I added a few functions and I am having some more issues with getting Rkfixed to work with my system of equations. Last issue was setting origin to 1, and a units issue. I checked units and they are all correct, so I am at a loss as to what the current issue is that is preventing rkfixed from solving.

For the excel file, read in rows 2-47, and columns A-J.

4 REPLIES 4

Nov 13, 2017
12:43 PM

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Nov 13, 2017
12:43 PM

What do you get when you evaluate

Dt(t.0,Tt)=

to the right of, or below, the definition of Tt

?

Luc

Nov 13, 2017
12:48 PM

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Nov 13, 2017
12:48 PM

If I evaluate Dt(0,Tt) I get a 1 column 5 row matrix output of non-zero answers

If I evaluate Dt(t0,Tt) I get an error "this variable is undefined"

Nov 13, 2017
01:00 PM

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Nov 13, 2017
01:00 PM

OK, so there's little wrong in the definition of Dt().....

Yes, t0 is undefined. I meant t.0 ( with the '.' indicating subscript, so 't-subscript-0' if you will ).

if Dt(t.0,Tt) produces the same result as Dt(0,Tt), then I don't know what's wrong.

Luc

Nov 13, 2017
01:11 PM

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