Davide Liessi

Can you please copy&paste your input equations here as text (not as an image)? Thank you.

Dear Wei Jian, sorry for letting you wait. I looked into your system and your input and I see the following problems. In your input there are two equations for each of y1, y3 and y5, while only one should appear, specifically the differential one. If you want to use the names psi, delta and q for those coordinates (to keep closer to the mathematical notation), you certainly can: just declare them in the coordinates field and use them instead of y1, y3 and y5. (I would even suggest, for clarity, to...