You can use "for-loops" within the nonlinear constraint function in MATLAB's Optimization Toolbox, as long as the function returns two outputs: one for inequality constraints ("c", where each element must be ≤ 0) and one for equality constraints ("ceq", where each element must be = 0). This is useful for problems like ensuring that all pairs of nodes maintain a minimum distance—by looping through each pair, computing the Euclidean distance, and constructing the constraint as "d - distance ≤ 0".
Please refer to the MathWorks documentation under “Nonlinear Constraints” at www.mathworks.com/help/optim/ug/nonlinear-equality-and-inequality-constraints.html and in the "fmincon" function reference at www.mathworks.com/help/optim/ug/fmincon.html to understand more regarding this.
