MATLAB: What is the purpose of fminimax

fminimaxmultiobjective optimizationoptimization

Is fminimax(@myFun1, x0) equivalent to fminunc(@myFun2, x0), where myFun1 and myFun2 are defined as follows:

function myFun1(x)
return [f1(x) f2(x) f3(x)];
end
function myFun2(x)
return max([f1(x) f2(x) f3(x)]);
end

and f1, f2, f3 are some arbitrary functions. If so, what's the use of fminimax? Does it perform better?

Best Answer

Look at the end of this page to see a short discussion of this topic.

Alan Weiss

MATLAB mathematical toolbox documentation

Related Solutions

MATLAB: Expressing a matrix with parameters and letters

Define the variables F1, F2, and F3 as symbolic variables.

syms F1, F2, F3
B = inv(A);
b = [0 F1 0 F2 0 F3 0 0 0 ]’;
x = B*b;

Refer here for more information

MATLAB: How to make output of a function available to script without function call

The file "myfun.m" is missing the function keyword. It should look like

function f1 = myFun(X,Y)
  [f1,f2] = myFun2(X,Y);    %It calls myFun2

end

And myfun only returns f1, not both f1 and f2. If you want it to return both, you have to list both on the function line

function [f1, f2] = myFun(X,Y)
  [f1,f2] = myFun2(X,Y);    %It calls myFun2
end

The script "myscript.m" has an extra "end" at the end of the file. It's a script, not a function so it should not have an end. Actually functions don't even need "end" statements, and I never use them.

myscript.m should look like

% Script file contains:  
X = [1 2;  4 5;  6 7];
Y = [8 9;  10 11];
% Get only f1, not f1 and f2 from myFun1.
f1 = myFun1(X,Y); % Calling myFun1 from myScript
[f1,f2] = myFun2(X,Y)
f1 = X*Y;            % 3x2 matrix

f2 = pdist2(X,Y);    % 3x2 matrix

Note that myFun1() will not call myfun.m because it has a 1 at the end of it so you must have a myFun1.m file or else you'll get an error.

Best Answer

Related Solutions

MATLAB: Expressing a matrix with parameters and letters

MATLAB: How to make output of a function available to script without function call

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