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| Thanks, Dave. I do have an OpenAI key -- in fact, two of them, one for each account. I think that one of these accounts does have some credit, but the second account has no credits (because OpenAI doesn't want people to use multiple accts to get... |
| [![enter image description here][1]][2] &[Wolfram Notebook][3] [1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=Controltheorybookcover.png&userId=20103 [2]:... |
| The good news, in v13.1, is that the bug for more than two plots seems to have been fixed. The bad news is that I systematically get warnings for all uses of PlotLayout -> "Row" (or "Column") that look like "Part::partw: Part 2 of... |
| I am having trouble solving a 4th-order nonlinear PDE ("Swift-Hohenberg equation"). I understand that higher-order derivatives are problem and tried to write it as a two second-order equations, with periodic boundary conditions. It hangs (see... |
| I contacted Wolfram Support. Apparently, the message is deliberate and reflects an internal evaluation that gets triggered whenever there is a discontinuity in the function. In any case, an easier way to solve the issue is to use a built-in... |
| Replacing my old 12.1.1 (downloaded June 16, before the fix of June 23) has solved the problem. Many thanks to you both! |