Hello,

I have the following function form as one of my constraints :

f(x) = MIN(0, x)

Because of the MIN, it is non-differentiable.

As I would like to use an optimizer that uses derivative based methods, I need my objective function and constraints to be differentiable.

How could I convert (or approximate) this function into a differentiable one?

Here is an example of data and the function chart, even if it is trivial.