Undefined function 'Fun" for input argument of type 'double'?

function z=fun(U)
z='FPAeld1';
end

i need to call the first script from this algorithm but i'm getting error "undefined function 'Fun'.." why?

Answer 1

[James Tursa]

I see a "fun" but I don't see a "Fun" anywhere. Do you have a file Fun.m that you are trying to call? Or are you trying to call "fun"?

[JL555]

no there's no Fun file ...Fun comes in here

% Initialize the population/solutions
for i=1:n,
  Sol(i,:)=Lb+(Ub-Lb).*rand(1,d);
  Fitness(i)=Fun(Sol(i,:));

[James Tursa]

Yes, I see the call to Fun ... what I don't see is a function called Fun anywhere. The only thing I see is lower case fun.

[JL555]

i'm calling the first script in the last lines of the algorithm..is that the correct way to do it?

[James Tursa]

Exactly what code are you trying to run when you call Fun? Please repeat the first few lines in your response so we know exactly. That code needs to be in a file (e.g. Fun.m) or a sub-function ... and I don't see that.

[JL555]

i'm not trying to call any Fun file. All i need is to call the first file which is a function file..FPAeld1.m is the name of the file

[James Tursa]

If you are trying to call FPAeld1, then why does your code call Fun? Why aren't you calling FPAeld1?

[JL555]

yes its in a file called FPAeld1.m...

[James Tursa]

Which line do you want to call FPAeld1? If it is this line:

Fitness(i)=Fun(Sol(i,:));

Then change it to this:

Fitness(i)=FPAeld1(Sol(i,:));

[JL555]

ok thanks alot ...

[JL555]

and how do i code such the the first script takes the data from the second script?

[Stephen23]

The answer to this is very simple: stop writing scripts and write functions instead. While scripts are great for playing around with some data and getting things going, functions offer many many advantages over scripts, including their own name spaces, algorithm abstraction, the ability to pass variables in and out, and lots of other handy stuff.

Turn your scripts into functions and pass that data as an output.

[JL555]

@Stephen-would really help if you give an example with that second script

Answer 2

[Walter Roberson]

At the bottom you have

function z=fun(U)
z='FPAeld1';
end

Change that to

function z = Fun(U)
  z = FPAeld1(U);
end

[JL555]

and how do i code such that the first script takes the data from the second script?

[Walter Roberson]

function z = Fun(U)
  global objfun
  z = feval(objfun, U);
end

Better yet, do not use global variables. For example in your second script, do not have global objfun and instead have

objfun = @FPAeld1

and then change your

function [best,fmin,N_iter]=fpa_demo(para)

to

function [best,fmin,N_iter]=fpa_demo(para, Fun)

and do not have that "function Fun" at the end of the code.

[JL555]

have u tried running the code?

[JL555]

function z = Fun(U)
  global objfun
  z = feval(objfun, U);
end

this should replace the last line of the algorithm?

[Walter Roberson]

I have not tried to run the code. You have not shown what should be passed to fpa_demo() . Your script does not call fpa_demo()

Yes, the lines

function z = Fun(U)
  global objfun
  z = feval(objfun, U);
end

would replace what you had as

function z=fun(U)
z='FPAeld1';
end

[JL555]

From this algorithm script all i want to do is call the first script which is a function script. Is that possible ?? if not then what should i do because i'm really confused with all this

[JL555]

Did what u said but now this error comes

Error using  * 
Inner matrix dimensions must agree.

Error in FPAeld1 (line 35)
 F=Pi.*Pi*a1+Pi*b1+c1+mod(ei*sin.*(fi*(pmin-Pi)))

[Steven Lord]

Poster extracted this error into a new Answer.