Giuseppe Casale wrote: ↑Thu Apr 11, 2019 6:06 pm
Well, I loaded some old programs and they also did not work properly.
Were those old programs functions for use with SOLVE as well, or did you have trouble running programs in general?
If they were SOLVE programs, were you solving for the same parameter each time?
Giuseppe Casale wrote: ↑Thu Apr 11, 2019 6:06 pm
I don't know what happened so I made a reset and now those programs and the solver works correctly.
I really would like to understand what happened; maybe I made some incorrect operation, but what?
The failure mode sounds unfamiliar, but the one thing I could imagine happening is pathological guesses, left behind from a previous SOLVE execution, causing the solver to give up immediately. You can make sure that isn't happening by providing
two starting guesses; in your example, you could have tried 0 [C] 0 [C] [C]. (The two starting guesses do not have to be different.)