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Why does FindMinimum return 'The function value Null is not a real number'?

Marco Gorelli
Posted 11 years ago
POSTED BY: Marco Gorelli
7 Replies
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If I plot your function, it appears to have a lot of discontinuous steps in it with a general trend of decreasing for m greater than about 5.5.
POSTED BY: Frank Kampas
Marco Gorelli
Marco Gorelli
Posted 11 years ago

It's c*m.

Ok, I'll try, thanks.
POSTED BY: Marco Gorelli
POSTED BY: Frank Kampas
Marco Gorelli
Marco Gorelli
Posted 11 years ago

I've now tried this f[m_?NumberQ] := Catch[Do[a = 2^(m(1 - c)) - 2.718/((m^.5)23.14c^(cm + .5) (1 - c)^((1 - c)*m + .5)); If[a <= 0, Throw[m/(m (1 - c) + 1)]], {c, 0.006, 1, 0.001}]]

however, FindMinimum still doesn't work and tells me I'm making invalid comparisons.
POSTED BY: Marco Gorelli
POSTED BY: Frank Kampas
Marco Gorelli
Marco Gorelli
Posted 11 years ago
POSTED BY: Marco Gorelli

For optimizing a numerical function, the best approach for FindMinimum is to define a function and specify that the argument or arguments are numeric using _?NumberQ
POSTED BY: Frank Kampas
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