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Hi, i need to solve the diff the funktion q.total(t.0) to find its maximum value. It alsways says t.0 not defined. What do I do wrong? Pls help.  Fin-Heatexchanger.sm (29kb) downloaded 11 time(s). Edited by user 22 November 2023 23:48:43(UTC)
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Joined: 23/07/2013(UTC) Posts: 1,128  Was thanked: 509 time(s) in 339 post(s)
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Direct answers to questions are more beneficial than no-meaning replies. You don't need to ignore units, if possible never do that. If unit ignore suggestion comes from Jean, especially ignore it. He is notorious being wrong with engineering problems. If it comes from {mkraska, Razonar, uni, etc} you can take it serious. Regards Fin-Heatexchanger_solved.sm (37kb) downloaded 11 time(s).
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Originally Posted by: overlord  Direct answers to questions are more beneficial than no-meaning replies. You don't need to ignore units, if possible never do that. If unit ignore suggestion comes from Jean, especially ignore it. He is notorious being wrong with engineering problems. If it comes from {mkraska, Razonar, uni, etc} you can take it serious. Regards Fin-Heatexchanger_solved.sm (37kb) downloaded 11 time(s). Thank you very much!
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Originally Posted by: Jonah I need to solve the diff the function q.total(t.0) to find its maximum value. As given you have the range of minimum values. For min/max of function ... Golden Ratio.
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Joined: 23/07/2013(UTC) Posts: 1,128 Was thanked: 509 time(s) in 339 post(s)
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Originally Posted by: Jonah Thank you very much! Sometimes general numeric solvers; solve(), roots(), FindRoot(); struggle with functions involving diff(), int(), sum(), profuct(), if(), cases(), etc. In your case solve() could answer it. There are some situations which can't be answered by general numeric solvers. Usually al_nleqsolve(), maple() or Maxima() can solve them.
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