How do i know the limits for maxfunevals and tolx?

How do i know the limits for maxfunevals and tolx? I get an error "fmincon stopped because it exceeded the function evaluation limit, options.MaxFunctionEvaluations = 7000 (the selected value).

x0=[70; 15; 1.2; 10; 100; 70000]; % Initial values for x

lb=[50; 8; 1.0; 5; 50; 50000]; % Lower Bound for variables

ub=[200; 20; 1.25; 20; 120; 130000]; % Upper Bound for variables

options = optimset('Algorithm','interior-point','MaxFunEvals',7000,'TolCon',.01,'TolX',1e-9)

[Walter Roberson]

The number of function evaluations required depends upon the complexity of the constraints, for linear and quadratic problems. For nonlinear / nonquadratic problems then the number of function evaluations can be difficult to predict, and in general it can show that the number of evaluations required can be unbounded for some nonlinear problems.

Answer 1

[Star Strider]

You can set them to be whatever you like (within limits). If you want to know the default values, use an optimoptions (link) call:

oldopts = optimoptions(@fmincon);
MFE = oldopts.MaxFunEvals
TX = oldopts.TolX
ALG = oldopts.Algorithm

producing:

MFE =
        3000

TX =
        1e-10

ALG =
    'interior-point'