Error Not enough input arguments using Fmincon with nlcon and linea... (2024)

Thanks to Walter Roberson and Nicolas Schmit for suggestions. I got out of previous error, but now encountering Error using fmincon (line 609) Supplied objective function must return a scalar value.

You have

This says that no matter what the input is, a vector of zeros is to be returned.

You then store other things into f, but those will be ignored: when you define an anonymous function with reference to a variable, then the value of the variable is captured as of the time the anonymous function is defined.

If you were to move the

to just before

then the changed value of f would be captured and returned when the function was invoked. However, fmincon requires that the function return a scalar value.

You also have

and you have

so test3 will be invoked once with xo, tau, L, m and would be expected to return a function handle that could be invoked each time to test whether the current variables met the constraints. However, test3 returns a numeric value, not a function handle.

You could try

This will at least execute, though ignoring all of the values you carefully placed into f.

Note: we also see in ctp3 that you have

and we see in test3 that you have

Was the intention that ceq should result in 0? Since you defined sum as 0?

It is not a syntax error to define sum as a variable, but you can be very sure that defining sum as a variable will confuse people reading your code. If you continue to use sum as the name of a variable, sooner or later you will encounter a situation where you try to use sum as a function in the context where it is a variable, and then you will get rather confused as you try to figure out what is happening.

I also tried

where mycon is a MATLAB function such as

function[c ,ceq]=test3(s,tau,L) results a vector but fmincon needs a scalar. when i use fmincon it shows error :

when i use fgoatattain, it gives error

moreover, i am confused to select values for goal in my code, what is criteria to choose goal values for fgoalattain?

Thanks for your help

You still have

which tells it to ignore the input s and to always return the content of f, a constant vector. Are you sure that is what you want to do? Is your purpose to try to find a point that violates the constraints the least -- that you do not actually care about the return value of myfun and only want to try to figure out where some points are that (nearly) satisfy the constraints?

Perhaps you want something like

??

Thanks Thanks to Walter Roberson. my simulation got successful by defining fun=@(s)X(n)*s(1)+x(t)*s(2)+V*C(n)*s(3)+Q(t)*s(4)+QD(t)*s(5)+Ve*s(6)+Vt*s(7)+f(1,u)*s(u); Thank you very much.