Model sigmoid function as convex optimisation with logical constraint

Nonconvex
7

I didn’t read the scope of the parentheses carefully enough. That first additive term is problematic. CVX will accept

cvx_begin
variable x
maximize((param(2)-param(1))*inv_pos(1+10^(param(3)-x*param(4))))
cvx_end

The first step is to prove (for any logic branch of your constraints), that your problem is convex. I’m rather dubious yours is.

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