MaplePrimes - answers and comments on Question, Why does DynamicSystems recognise an AlgebraicEquation as a Differential Equation?

Missing multiplication operator

Joe Riel — Thu, 17 Jan 2013 02:06:48 Z

The problem lies in the first ln: (1+(XL)^(2))(1+(YL)^(2). There should be a multiplicative operator between the two additive terms. Without that, Maple interprets this as function application. I'll make a change to AlgEquation so that it returns the offending terms when it detects an error.

@JotaTR I would also replace tan^(-1) with

Thomas Richard — Thu, 17 Jan 2013 15:25:16 Z

@JotaTR I would also replace tan^(-1) with arctan, as the former won't work in 1D input aka Maple notation.
Finally, I'd replace (...)^0.5 with sqrt(...), but that's a matter of taste.

Thanks

JotaTR — Thu, 17 Jan 2013 20:25:45 Z

I have made the changes that you suggested and its working.

Thanks to both.