How to pass extra parameters to custom Output Function?

Hi,

I want to pass

test_var = 5;

to the custom output function

[state, options,optchanged] = testFCN(options,state,flag)

in the optimoptions of gamultiobj().

I tried:

[state, options,optchanged] = testFCN(options,state,flag,settings)

and

test_handle1 = @(options,state,flag) testFCN(options,state,flag,test_var);
test_handle2 = @(x) testFCN(x,test_var);

but I always get the error

Too many input arguments.

What am I doing wrong?

Answer 1

[Voss]

Regardless of whether you define a function handle that uses testFCN or you call testFCN directly, make sure your testFCN is defined to accept up to four input arguments.

(You can check how many arguments are given using nargin, and act accordingly.)

test_var = 5;
options = [];
state = [];
flag = false;
settings = [];

% testFCN_1 is defined as having 3 input arguments
% testFCN_2 is defined as having 4 input arguments
% testFCN is defined as having 4 input arguments, with the 4th being optional
% (see the definitions at the bottom)

% try calling testFCN_1 with 3 inputs -> OK
try
    [state, options,optchanged] = testFCN_1(options,state,flag);
    disp('Worked OK');
catch ME
    disp(ME.message);
end

Worked OK

% try calling testFCN_1 with 4 inputs -> error
try
    [state, options,optchanged] = testFCN_1(options,state,flag,settings);
    disp('Worked OK');
catch ME
    disp(ME.message);
end

Too many input arguments.

% try calling testFCN_2 with 3 inputs -> different error (if 4th input is needed)
try
    [state, options,optchanged] = testFCN_2(options,state,flag);
    disp('Worked OK');
catch ME
    disp(ME.message);
end

Not enough input arguments.

% try calling testFCN_2 with 4 inputs -> OK
try
    [state, options,optchanged] = testFCN_2(options,state,flag,settings);
    disp('Worked OK');
catch ME
    disp(ME.message);
end

Worked OK

% testFCN (using nargin) can take 3 or 4 inputs:
% try calling testFCN with 3 inputs -> OK
try
    [state, options,optchanged] = testFCN(options,state,flag);
    disp('Worked OK');
catch ME
    disp(ME.message);
end

Worked OK

% try calling testFCN with 4 inputs -> OK
try
    [state, options,optchanged] = testFCN(options,state,flag,settings);
    disp('Worked OK');
catch ME
    disp(ME.message);
end

Worked OK

function [state, options,optchanged] = testFCN_1(options,state,flag) % 3 input arguments
    optchanged = flag;
end

function [state, options,optchanged] = testFCN_2(options,state,flag,settings) % 4 input arguments
    optchanged = settings;
end

function [state, options,optchanged] = testFCN(options,state,flag,settings) % 4 input arguments, 4th optional
    if nargin < 4
        % if settings is not given, use some default value
        settings = [];
    end
    optchanged = settings;
end

[e_frog]

Thanks, I copied my mistake to this thread. 'settings' should have been 'test_var' as well. Now it works!