Confused about units in D(t,X) for AdamsBDF

[gracespeakss1]

Please looking at the function in adamsBDF, why is it red?

Thanks

[Fred_Kohlhepp · Accepted solution]

Not sure why it's red, but

shouldn't D(t,u) have at least one "t" in it?

and

are you really calling columns of arrays?  <2>

[gracespeakss1]

Thanks for the prompt response.

its power 2

[LucMeekes]

The error message should tell you why it is red. What does it say?

Please attach the worksheet. (You may have to zip it first, there's a nasty error in this forum still, that often prevents it to recognise valid mathcad files).

Luc

[Fred_Kohlhepp]

You can use an old method and solve this in time steps