How can i add a variable which is a function of some decision variables- parameters to my model?

I have a situation which i can not properly added to my model in gurobi python.

I have a decision variable set lets say x[i] for i = 1 to I

and i have a parameter set which is c[i] for i = 1 to I

I want to add my model a new variable which is composed of mentioned 2 above.Lets say;

D[i] = max(0,x[i] - c[i]) for i = 1 to I

I tried to construct D[i] by using addMVars function and than equating it to max(0,x[i] - c[i])

in constraint part yet i am having type error while adding such constraint. How can i add such variable in general which is function of other variables-parameters.

Thanks in advance...

How can i add a variable which is a function of some decision variables- parameters to my model?

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