Optimtool not enough arguments

both while running the code and optimtool i get the error that not enough arguments

function ar = fun(a)

A=[8+a 1

2 3];

ar =det(A);

end

Error in the following problem input(s):

objective: Not enough input arguments.

[Walter Roberson]

Please show the code that invokes the optimization algorithm

[Walter Roberson]

By the way you can optimize that calculation as

 ar = 3*a+22

[Yashwardhan Panwar]

function ar = fun(a)

A=[8+a 1

2 3];

ar =det(A);

end

[Yashwardhan Panwar]

i want to optimse in this way because this a test code i will be implementing the logic on a big matrix

[Walter Roberson]

How do you start the code running? Which buttons do you press or what do you type in?

[Yashwardhan Panwar]

With the code in the script i press the run button , then i get the error and then i launch the optimtool from the command window and after i run the optimisation then also i get the error

[Walter Roberson]

Okay, so when you press the Run button when you are in the editor for fun.m, what value do you expect MATLAB to use for the variable a and why do you expect it to use that particular value?

[Yashwardhan Panwar]

i dont't know. Is there a way then to optimise a function?

[Walter Roberson]

Yes, there are a number of ways to optimize a function. For example,

a_guess = randi([-1e6 1e6]);
best_a = fmincon(@fun, a_guess)

In the case of this particular function, the optimal would be -inf

Answer 1

[Koushik Vemula]

According to my understanding you are facing this problem because of the way you are trying to access the function.

You need to store your function in a separate ‘.m’ file (say ‘XYZ.m’)

Now you can call the function in this manner

XYZ(a) % a – your desired number

If you try to run a file which contains the definition of a function which has input arguments then you'll get those errors which you've faced