Not enough input arguments for 'bayesopt'?

Hello,

I just started with MATLAB today and was doing most of my work in Python so far. I need to use MATLAB for some specific project and im lost. I wanted to use BayesianOptimization tool 'bayesopt', but i can't seem to get it to work even for simple tasks.

My code:

x=optimizableVariable('x1',[-1 1]);

BayesObject=bayesopt(fun1,[x]);


fun1(0);

function y=fun(x)
y=x^2;
end

function [objective] = fun1(x)
objective=x^2
end

Which returns errors:

>> PythonTest
Not enough input arguments.

Error in PythonTest>fun1 (line 13)
objective=x.^2

Error in PythonTest (line 3)
BayesObject=bayesopt(fun1,[x]);

I hope someone can help me. Thank you very much.

[Luka Znidaric]

I managed to get it working with:

var=optimizableVariable('x1',[-1 1]);

BayesObject=bayesopt(objfun,[var]);

objfun=@(x) fun(x)

function y=fun(x)
y=x^2;
end

But now i get errors:

Undefined operator '^' for input arguments of type 'table'.

Error in PythonTest>fun (line 8)
y=x^2;

Error in PythonTest>@(x)fun(x)

Error in BayesianOptimization/callObjNormally (line 2553)
                        Objective = this.ObjectiveFcn(conditionalizeX(this, X));

Error in BayesianOptimization/callObjFcn (line 481)
                        = callObjNormally(this, X);

Error in BayesianOptimization/runSerial (line 1989)
                    ObjectiveFcnObjectiveEvaluationTime, ObjectiveNargout] = callObjFcn(this, this.XNext);

Error in BayesianOptimization/run (line 1941)
                this = runSerial(this);

Error in BayesianOptimization (line 457)
            this = run(this);

Error in bayesopt (line 323)
Results = BayesianOptimization(Options);

Error in PythonTest (line 3)
BayesObject=bayesopt(objfun,[var]);

Can somebody maybe help me with this?

Thanks in advance, have a nice day!

Answer 1

[Alan Weiss]

Please look at the documentation on Bayesian objective functions. The bayesopt solver passes a table to the objective function. To access variables in the table, use dot notation.

function y = fun(t)
y = t.x1^2;
end

Alan Weiss

MATLAB mathematical toolbox documentation

[Luka Znidaric]

Thanks Alan! With your help and some more tinkering of my own I managed to get it working for now.

Be well!

[Aden Lee]

Mind to share what changes you have made to your code ? I'm interested.