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The i.c. is not ignored. It's because `NDSolve` hasn't used enough grid points for spatial discretization. Hans doesn't observe this phenomenon in version 7 because there's a silent change in prior error estimation of `NDSolve` in version 9. This...
I'm not sure when it's improved, but at least since _v12.3.1_, we no longer needs to split into triangle!: area[pts_] := Area[Polygon[pts], Assumptions -> {0 0} (* {28} *)
Cross posted [in Mma.SE]( Solved there.
Thank you for your reply.
Cross-posted in
For second error: I want to save the result of NDSolve[] to slider. I think when the first error is solved. The second error will be solved automatically.
This is unusual. It appears to be a quick rewrite of ["Standard Packages for Mathematica 3":][1] which has the same first sentence "The Durbin-Watson d statistic is used for testing the existence of a first-order autoregressive process" on page...
Hello Rohit, that looks great, but on my system that doesn't work. I don't know why, there is a Part - Error. Ok, I am using a hand-axe material out of the stone - age. Part::partw: Part 1 of {} does not exist. >> Part::pspec: Part...
But how can I get the corresponding international phonetic alphabet (IPA)? `WolframAlpha` doesn't seem to help.