Hey johnny, I've got mine working now but I still don't know what was wrong with it originally! I started a new worksheet and re-wrote it which seemed to do the trick, not sure why because all the positioning and declarations were exactly the same... Sorry I can't provide a more helpful answer!
Homework Statement
I'm trying to use the rkadapt function in mathcad 13 but it's coming up in red and telling me 'This function cannot be used here'. Not really sure why because all the constants used have been defined above it and take sensible values. The values of x1 and x2 have been...