Please help me - Fuzzy problem

First error (marked in red) is in the equation for u(x,y)

variables m, M , g & l need to be defined before it, or added as parameters.

All of them are defined in the solve block , but they don't appear to need to be there.

This shows the next issue - the Odesolve statement.

This error is not very helpful but the problem here is probably that you have used a reference to u ,I think that it should be u.t(x(t),y(t)) .

All I can do is help to get the sheet working, if it isn't quite right , hopefully you can make the necessary corrections.

Unfortunately the u.t function isn't used in the starting example.

This now just needs the value of T (ending time) to be defined, before the given statement.

I have set this at 10 as any more seems to give an overflow error that I don't understand.

Up to 10 the result appears to accelerate one way & I suspect that this is not the answer that you want.

The first step of making the sheet produce an answer is achieved, now you need to work out if the result is correct & any changes to fix it if not

If you want to be able to quickly see the effect of a change to one of the variables then you can use the global equals symbol , as used on m and M .

And you can see m by the side of the plot , changes to this equation will affect the whole sheet (unless it is redefined at some point).

I would be interested to know the final result of the work sheet - I always think that there are many things to be learnt from every problem.

Regards

Andy