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| I found the answer: I needed a shorter directory name. I suspected that earlier, but when I got rid of the CreateDirectory thing and forced a short name like "gloop" on the tag end of Temp, it still didn't run. I thought sure I was short... |
| Follow-up in community.wolfram.com/groups/-/m/t/188837. |
| The next thing you need to do, aside from supplying numerical values to your variables, is to give your rule a name. Let's just call it ruel for now:[mcode]In[5]:= ruel = DSolve[{Derivative[2][Subscript[u, 0, 0]][y] + ... |