I'm currently useing fminsearch, fmincon and fminunc in my code, and I do not know, how wide the range they search, before giving a minimal place for a function. I want to make a valadation process, and I don't know how hould I change the initial point for the ''fmin'' functions. For example if my initial points are [1 1 1], how dose those functions fearch. Do they try every combination with definite steps from [-5 -5 -5 ] to [7 7 7] for example, or does it varys how they search for the minimum? How can one determine the initial point to try?