total = {{0., 0.}, {1., 0.0425}, {2., 0.06375}, {3., 0.11}, {4., 0.15625}, {9., 1.2}, {14., 0.94375}, {19., 1.08875}}
FindFit[total, y'[t] == a*Tanh[b*t], {{a, 0.01}, {b, 0.01}}, t, PrecisionGoal -> 5, AccuracyGoal -> 5]
我想直接对这个微分方程的微分形式拟合,找出最佳a和b,但提示这种报错我看不懂是怎么回事,有人能为我解答么?
(total的数据就是 dy dt的具体值,无需向前向后或中心差分来算出近似导数)