How to disable fmincon from output notices?

Hi!

I'm using fmincon to solve optimization problems. And I don't particularly want fmincon to tell me that:

_Local minimum possible. Constraints satisfied.

fmincon stopped because the predicted change in the objective function is less than the default value of the function tolerance and constraints are satisfied to within the default value of the constraint tolerance.

criteria details

No active inequalities. _

It is quite annoying when I'm using fmincon in every iteration of a loop. Can this output be disabled? I read through fmincon's on-line documentation but didn't find an option for that purpose.

Xianwen

Answer 1

[Oleg Komarov]

Check the display option: http://www.mathworks.co.uk/help/toolbox/optim/ug/fmincon.html#f854721

[Xianwen]

Thank you Oleg. Problem solved.

[tpalm]

Hello! Thanks for the suggestions. I tried a lot using this suggestion and reading the document multiple times, but I still face the same problem as the one asked here. My code-

fun= @(q) -p*q ;
q0=[0.1;0.1;0.1;0.1;0.1;0.1];
Aeq = T;
beq = Y;
A=[];
b1=[];
lb=[0;0;0;0;0;0];
ub=[];
options = optimoptions('Display','off');
q = fmincon(fun,q0,A,b1,Aeq,beq,lb,ub,options);

And I get an error like this-

error using optimoptions (line 124)
Invalid solver specified. Provide a solver name or handle (such as 'fmincon' or @fminunc).
Type DOC OPTIMOPTIONS for a list of solvers.

[Alan Weiss]

options = optimoptions('fmincon','Display','off');

Alan Weiss

MATLAB mathematical toolbox documentation

[Rahul Bhadani]

I tried your answer and I got this:

Error using optimfcnchk (line 99)
NONLCON must be a function.
Error in fmincon (line 437)
   confcn =
   optimfcnchk(NONLCON,'fmincon',length(varargin),funValCheck,flags.gradconst,false,true);
   Error in QPSK_optim (line 61)
    [x,fval,exitflag,output] = fmincon(f,x0,A,b,Aeq,beq,lb,ub, options); 

looks like as per MATLAB 2020a options should be followed by nonlcon but at times, I don't want to provide nonlcon so how to supress outputs?

[Steven Lord]

From the documentation page: "x = fmincon(fun,x0,A,b,Aeq,beq,lb,ub,nonlcon,options) minimizes with the optimization options specified in options. Use optimoptions to set these options. If there are no nonlinear inequality or equality constraints, set nonlcon = []."

You have to specify nonlcon if you want to specify options since the inputs must be in a fixed order. But you can specify it as [] to tell fmincon you don't have any nonlinear constraints.

[Rahul Bhadani]

Ah, thank you. It worked.