Hello,

I have an expression that I have to minimize. The expression is a sum of piecewise functions each function depending on 3 variables.

Let's say **Si**(ai,bi,ci) is my function, i goes from 1 to N. The sum that I try to minimize is The sum of all **Si** functions (i from 1 to N).

Is the first derivative an option in this case? We're talking about 3*N variables (ai,bi,ci where i is from 1 to N).

Thanks,

Iulian