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Nov 10, 2019 at 11:35 vote accept xinxin guo
Nov 10, 2019 at 11:35 comment added xinxin guo @Michael E2 Thanks for attentions. I don't think it is a bug and adding "LocationMethod" -> "LinearInterpolation" is helpful, as documented in the builtin reference of NDSolve.
Nov 9, 2019 at 21:12 comment added Michael E2 I don't see why NDSolve should fail to detect the events. I think it's a bug. Please report it to WRI support.
Nov 9, 2019 at 17:33 comment added Michael E2 You might want to plot fc[x1[t], x2[t], x3[t], x1'[t], x2'[t], x3'[t]] - f[u[t], y'[t], x1[t]]) f[u[t], y'[t], x1[t]] versus v[t] to see if every event was captured by NDSolve.
Nov 9, 2019 at 17:20 answer added Alex Trounev timeline score: 3
Nov 9, 2019 at 15:26 history edited xinxin guo CC BY-SA 4.0
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Nov 9, 2019 at 14:37 history edited xinxin guo CC BY-SA 4.0
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Nov 9, 2019 at 14:31 history edited xinxin guo CC BY-SA 4.0
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Nov 9, 2019 at 14:25 history edited xinxin guo CC BY-SA 4.0
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Nov 9, 2019 at 14:22 comment added xinxin guo Thanks. Acctually the most important result to me is u[t].
Nov 9, 2019 at 14:20 history edited xinxin guo CC BY-SA 4.0
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Nov 9, 2019 at 14:17 comment added Ulrich Neumann Sorry I didn't recognize vmax in sol2. Setting v[t]->1gives a good match of sol1 and sol2 in your second last plot (don't know why)
Nov 9, 2019 at 14:12 comment added xinxin guo Thanks. I tried your suggestion, but sol1 is still apparently different from sol1 (for example u[t] of sol1 and sol2). BTW, why did you suggest that changing v[t]->2.25 to v[t]->1 ? my vmax is 2.25, not 1, and it jumps between 0 and vmax(2.25).
Nov 9, 2019 at 14:07 history edited xinxin guo CC BY-SA 4.0
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Nov 9, 2019 at 14:05 comment added Ulrich Neumann Change your second WhenEvent v[t]->2.25 to v[t]->1 ! Now the solutions sol1 an sol2 are the same!
Nov 9, 2019 at 14:04 history edited xinxin guo
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Nov 9, 2019 at 13:34 history asked xinxin guo CC BY-SA 4.0