Constraints On Curve Fitting Parameters

I am trying to impose bounds and constraints in my quadratic curve fitting process. Objective is to find coefficients a,b and c. Imposing constraint on b: delta-2*a*x is my doubt.

Solution 1:

What error do you get?

It looks to me like the code should work. But, in your message you said you wanted to constraint c to be delta+b+2*a*x while in your code you have delta-b-2*a*xpara. Is there a sign problem?

You also initialize delta to 5e-2, but set it's maximum value to 0. That seems like a mistake, possibly related to confusing signs.