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Thank you for your detailed analysis about numerical instability. As you mentioned, I could get the correct answer by using the higher order system in version 14.0, which is magic for me: DSolve[{D[2.3*r''[t] == 1 - r'[t], t], 2.3*r''[0] ==... |
Thank you for your selection and edition. I uploaded today's data with Japanese explanation. (But, my figure of plt[] becomes wrong again...) |
Thank you for your comment ! Please store a copy of my notebook. I would be happy to contribute your github (and everyone's projects). |