Hello everyone! this is the first time I am using GA and I encountered with this message:Failure in initial user-supplied fitness function evaluation. GA cannot continue.

here is my codes.

k1=0.6;
k2=0.25;
k3=0.15;
     
[x,fval] = ga(@(f)myfcn(f(1),f(2),f(3)),3)
         
function t=myfcn(f)
t=(k1*f(1)+k2*f(2)+k3*f(3));
end
%%all f values have been attained in another code

can anyone help me with this?

[Amir Hosseini]

Dear Geoff how can I find out at which iteration I got the result?

Answer 1

[Geoff Hayes]

amir - you don't need to supply the f, those f values that have been attained in another code. The genetic algorithm will provide those from the initial population and from the subsequent generations (via crossover and mutation). All you need to do is pass in the function handle like

[x,fval] = ga(@myfcn, 3)

Since your myfcn depends upon the k1, k2, and k3, then ensure that your fitness function is nested within the main function

function main

    k1=0.6;
    k2=0.25;
    k3=0.15;
         
    [x,fval] = ga(@myfcn,3)
             
    function t=myfcn(f)
        t=(k1*f(1)+k2*f(2)+k3*f(3));
    end
end

and saved (in this case) to a file named main.m. (Perhaps you have already done this.)

[Amir Hosseini]

thanks for youre attention Geoff!

actually I did it but still getting the same error. what should I do?

[Geoff Hayes]

amir - can you repost your code and the full error message?

[Amir Hosseini]

yes-
function myfun   %%which is main m.file

     k1=0.6;
     k2=0.25;
     k3=0.15;
     
     [x,fval] = ga(@(f)myfcn ,3)
         
    function t=myfcn(f)
        t=(k1*f(1)+k2*f(2)+k3*f(3));
    end
end

and the error is:

>> myfun
Not enough input arguments.

Error in myfun>myfcn (line 15)
t=(k1*f(1)+k2*f(2)+k3*f(3));

Error in myfun>@(f)myfcn(f)

Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)
fcn_handle = @(x) fcn(x,FcnArgs{:});

Error in makeState (line 47)
            firstMemberScore = FitnessFcn(state.Population(initScoreProvided+1,:));

Error in gaunc (line 40)
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);

Error in ga (line 398)
            [x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...

Error in myfun (line 11)
     [x,fval] = ga(fft,3)

Caused by:
    Failure in initial user-supplied fitness function evaluation. GA cannot continue.
 
>> myfun
Index exceeds the number of array elements (1).

Error in myfun>myfcn (line 15)
t=(k1*f(1)+k2*f(2)+k3*f(3));

Error in myfun>@(f)myfcn(f(1),f(2),f(3))

Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)
fcn_handle = @(x) fcn(x,FcnArgs{:});

Error in makeState (line 47)
            firstMemberScore = FitnessFcn(state.Population(initScoreProvided+1,:));

Error in gaunc (line 40)
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);

Error in ga (line 398)
            [x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...

Error in myfun (line 11)
     [x,fval] = ga(@(f)myfcn(f(1),f(2),f(3)),3)

Caused by:
    Failure in initial user-supplied fitness function evaluation. GA cannot continue.
 
>> myfun
Error using myfun>myfcn
Too many input arguments.

Error in myfun>@(f)myfcn(f(1),f(2),f(3))

Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)
fcn_handle = @(x) fcn(x,FcnArgs{:});

Error in makeState (line 47)
            firstMemberScore = FitnessFcn(state.Population(initScoreProvided+1,:));

Error in gaunc (line 40)
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);

Error in ga (line 398)
            [x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...

Error in myfun (line 11)
     [x,fval] = ga(@(f)myfcn(f(1),f(2),f(3)),3)

Caused by:
    Failure in initial user-supplied fitness function evaluation. GA cannot continue.
 
>> myfun
Error using myfun>myfcn
Too many input arguments.

Error in myfun>@(f)myfcn(f(1),f(2),f(3))

Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)
fcn_handle = @(x) fcn(x,FcnArgs{:});

Error in makeState (line 47)
            firstMemberScore = FitnessFcn(state.Population(initScoreProvided+1,:));

Error in gaunc (line 40)
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);

Error in ga (line 398)
            [x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...

Error in myfun (line 11)
     [x] = ga(@(f)myfcn(f(1),f(2),f(3)),3)

Caused by:
    Failure in initial user-supplied fitness function evaluation. GA cannot continue.
 
>> myfun
Error using myfun>myfcn
Too many input arguments.

Error in myfun>@(f)myfcn(f(1),f(2),f(3))

Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)
fcn_handle = @(x) fcn(x,FcnArgs{:});

Error in makeState (line 47)
            firstMemberScore = FitnessFcn(state.Population(initScoreProvided+1,:));

Error in gaunc (line 40)
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);

Error in ga (line 398)
            [x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...

Error in myfun (line 11)
     x = ga(@(f)myfcn(f(1),f(2),f(3)),3)

Caused by:
    Failure in initial user-supplied fitness function evaluation. GA cannot continue.
 
>> myfun
Error using functionHandleOrCell (line 12)
The constraint function must be a function handle.

Error in validate (line 228)
    [nonlcon,NonconFcnArgs] = functionHandleOrCell('NonconFcn',nonlcon);

Error in gacommon (line 65)
[options,nvars,FitnessFcn,NonconFcn] = validate(options,type,nvars,fun,nonlcon,user_options);

Error in ga (line 363)
    NonconFcn,options,Iterate,type] = gacommon(nvars,fun,Aineq,bineq,Aeq,beq,lb,ub, ...

Error in myfun (line 11)
     [x,fval] = ga(@(f)myfcn(f(1),f(2),f(3)),3,[],[],[],[],[],[],100)
 
>> myfun
Error using functionHandleOrCell (line 12)
The constraint function must be a function handle.

Error in validate (line 228)
    [nonlcon,NonconFcnArgs] = functionHandleOrCell('NonconFcn',nonlcon);

Error in gacommon (line 65)
[options,nvars,FitnessFcn,NonconFcn] = validate(options,type,nvars,fun,nonlcon,user_options);

Error in ga (line 363)
    NonconFcn,options,Iterate,type] = gacommon(nvars,fun,Aineq,bineq,Aeq,beq,lb,ub, ...

Error in myfun (line 11)
      [x,fval,exitFlag,output,population,scores]  = ga(@(f)myfcn(f(1),f(2),f(3)),3,[],[],[],[],[],[],100)
 
>> myfun
Error using preProcessLinearConstr (line 69)
The number of rows in Aeq must be the same as the length of beq.

Error in gacommon (line 97)
[Iterate.x,Aineq,bineq,Aeq,beq,lb,ub,msg,exitFlag] = preProcessLinearConstr( ...

Error in ga (line 363)
    NonconFcn,options,Iterate,type] = gacommon(nvars,fun,Aineq,bineq,Aeq,beq,lb,ub, ...

Error in myfun (line 11)
      [x,fval,exitFlag,output,population,scores]  = ga(@(f)myfcn(f(1),f(2),f(3)),3,[],[],100,[])
 
>> myfun
Error using preProcessLinearConstr (line 69)
The number of rows in Aeq must be the same as the length of beq.

Error in gacommon (line 97)
[Iterate.x,Aineq,bineq,Aeq,beq,lb,ub,msg,exitFlag] = preProcessLinearConstr( ...

Error in ga (line 363)
    NonconFcn,options,Iterate,type] = gacommon(nvars,fun,Aineq,bineq,Aeq,beq,lb,ub, ...

Error in myfun (line 11)
      [x,fval,exitFlag,output,population,scores]  = ga(@(f)myfcn(f(1),f(2),f(3)),3,[],[],100,[])
 
>> myfun
Error using preProcessLinearConstr (line 69)
The number of rows in Aeq must be the same as the length of beq.

Error in gacommon (line 97)
[Iterate.x,Aineq,bineq,Aeq,beq,lb,ub,msg,exitFlag] = preProcessLinearConstr( ...

Error in ga (line 363)
    NonconFcn,options,Iterate,type] = gacommon(nvars,fun,Aineq,bineq,Aeq,beq,lb,ub, ...

Error in myfun (line 11)
      [x,fval,exitFlag,output,population,scores]  = ga(@(f)myfcn(f(1),f(2),f(3)),3,[],[],100,[])
 
>> myfun
Error using preProcessLinearConstr (line 69)
The number of rows in Aeq must be the same as the length of beq.

Error in gacommon (line 97)
[Iterate.x,Aineq,bineq,Aeq,beq,lb,ub,msg,exitFlag] = preProcessLinearConstr( ...

Error in ga (line 363)
    NonconFcn,options,Iterate,type] = gacommon(nvars,fun,Aineq,bineq,Aeq,beq,lb,ub, ...

Error in myfun (line 11)
      [x,fval,exitFlag,output,population,scores]  = ga(@(f)myfcn(f(1),f(2),f(3)),3,[],[],100,[])
 
>> myfun
Error using myfun>myfcn
Too many input arguments.

Error in myfun>@(f)myfcn(f(1),f(2),f(3))

Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)
fcn_handle = @(x) fcn(x,FcnArgs{:});

Error in makeState (line 47)
            firstMemberScore = FitnessFcn(state.Population(initScoreProvided+1,:));

Error in gaunc (line 40)
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);

Error in ga (line 398)
            [x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...

Error in myfun (line 8)
      [x,fval] = ga(@(f)myfcn(f(1),f(2),f(3)),3)

Caused by:
    Failure in initial user-supplied fitness function evaluation. GA cannot continue.
 
>> myfun
Error using myfun/myfcn
Too many input arguments.

Error in myfun>@(f)myfcn(f(1),f(2),f(3)) (line 8)
      [~,~] = ga(@(f)myfcn(f(1),f(2),f(3)),3)

Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)
fcn_handle = @(x) fcn(x,FcnArgs{:});

Error in makeState (line 47)
            firstMemberScore = FitnessFcn(state.Population(initScoreProvided+1,:));

Error in gaunc (line 40)
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);

Error in ga (line 398)
            [x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...

Error in myfun (line 8)
      [~,~] = ga(@(f)myfcn(f(1),f(2),f(3)),3)

Caused by:
    Failure in initial user-supplied fitness function evaluation. GA cannot continue.
 
>> myfun
Error using myfun/myfcn
Too many input arguments.

Error in myfun>@(f)myfcn(f(1),f(2),f(3)) (line 8)
      [x,fval] = ga(@(f)myfcn(f(1),f(2),f(3)),3)

Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)
fcn_handle = @(x) fcn(x,FcnArgs{:});

Error in makeState (line 47)
            firstMemberScore = FitnessFcn(state.Population(initScoreProvided+1,:));

Error in gaunc (line 40)
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);

Error in ga (line 398)
            [x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...

Error in myfun (line 8)
      [x,fval] = ga(@(f)myfcn(f(1),f(2),f(3)),3)

Caused by:
    Failure in initial user-supplied fitness function evaluation. GA cannot continue.
 
>> myfun
Not enough input arguments.

Error in myfun/myfcn (line 12)
t=(k1*f(1)+k2*f(2)+k3*f(3));

Error in myfun>@(f)myfcn (line 8)
      [x,fval] = ga(@(f)myfcn ,3)

Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)
fcn_handle = @(x) fcn(x,FcnArgs{:});

Error in makeState (line 47)
            firstMemberScore = FitnessFcn(state.Population(initScoreProvided+1,:));

Error in gaunc (line 40)
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);

Error in ga (line 398)
            [x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...

Error in myfun (line 8)
      [x,fval] = ga(@(f)myfcn ,3)

Caused by:
    Failure in initial user-supplied fitness function evaluation. GA cannot continue.
 
>> myfun
Not enough input arguments.

Error in myfun/myfcn (line 12)
t=(k1*f(1)+k2*f(2)+k3*f(3));

Error in myfun>@(f)myfcn (line 8)
      [x,fval] = ga(@(f)myfcn ,3)

Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)
fcn_handle = @(x) fcn(x,FcnArgs{:});

Error in makeState (line 47)
            firstMemberScore = FitnessFcn(state.Population(initScoreProvided+1,:));

Error in gaunc (line 40)
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);

Error in ga (line 398)
            [x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...

Error in myfun (line 8)
      [x,fval] = ga(@(f)myfcn ,3)

Caused by:
    Failure in initial user-supplied fitness function evaluation. GA cannot continue.
 
>> myfun
Not enough input arguments.

Error in myfun/myfcn (line 12)
t=(k1*f(1)+k2*f(2)+k3*f(3));

Error in myfun>@(f)myfcn (line 8)
      [x,fval] = ga(@(f)myfcn ,3)

Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)
fcn_handle = @(x) fcn(x,FcnArgs{:});

Error in makeState (line 47)
            firstMemberScore = FitnessFcn(state.Population(initScoreProvided+1,:));

Error in gaunc (line 40)
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);

Error in ga (line 398)
            [x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...

Error in myfun (line 8)
      [x,fval] = ga(@(f)myfcn ,3)

Caused by:
    Failure in initial user-supplied fitness function evaluation. GA cannot continue.
 
>> myfun
Not enough input arguments.

Error in myfun/myfcn (line 12)
t=(k1*f(1)+k2*f(2)+k3*f(3));

Error in myfun>@(f)myfcn (line 16)
 [x,fval] = ga(@(f)myfcn ,3)

Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)
fcn_handle = @(x) fcn(x,FcnArgs{:});

Error in makeState (line 47)
            firstMemberScore = FitnessFcn(state.Population(initScoreProvided+1,:));

Error in gaunc (line 40)
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);

Error in ga (line 398)
            [x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...

Error in myfun (line 16)
 [x,fval] = ga(@(f)myfcn ,3)

Caused by:
    Failure in initial user-supplied fitness function evaluation. GA cannot continue.
 
>> myfun
Not enough input arguments.

Error in myfun/myfcn (line 12)
t=(k1*f(1)+k2*f(2)+k3*f(3));

Error in myfun>@(f)myfcn (line 8)
      [x,fval] = ga(@(f)myfcn ,3)

Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)
fcn_handle = @(x) fcn(x,FcnArgs{:});

Error in makeState (line 47)
            firstMemberScore = FitnessFcn(state.Population(initScoreProvided+1,:));

Error in gaunc (line 40)
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);

Error in ga (line 398)
            [x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...

Error in myfun (line 8)
      [x,fval] = ga(@(f)myfcn ,3)

Caused by:
    Failure in initial user-supplied fitness function evaluation. GA cannot continue.
 
>> myfun
Not enough input arguments.

Error in myfun/myfcn (line 12)
t=(k1*f(1)+k2*f(2)+k3*f(3));

Error in myfun>@(f)myfcn (line 8)
      x = ga(@(f)myfcn ,3)

Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)
fcn_handle = @(x) fcn(x,FcnArgs{:});

Error in makeState (line 47)
            firstMemberScore = FitnessFcn(state.Population(initScoreProvided+1,:));

Error in gaunc (line 40)
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);

Error in ga (line 398)
            [x,fval,exitFlag,output,population,scores] = gaunc(FitnessFcn,nvars, ...

Error in myfun (line 8)
      x = ga(@(f)myfcn ,3)

Caused by:
    Failure in initial user-supplied fitness function evaluation. GA cannot continue.
 
>> 

[Amir Hosseini]

sorry that was too long but you can catch me on [e-mail]

[Geoff Hayes]

amir - replace this line

[x,fval] = ga(@(f)myfcn ,3)

with just

[x,fval] = ga(@myfcn ,3)

You do not need to specify the imput parameter.

[Amir Hosseini]

wow thanks man it worked but I didn't get the desirable results of my article. However, youre answer was just accepted but do you think the wrong result may have caused by wrong f because we didn't assign the f for GA

[Geoff Hayes]

there could be any number of reasons why you didn't get the desirable results. Are you comparing against the results from a published article? Did they use a genetic algorithm? Do you know which crossover methods they used or mutation?

[Amir Hosseini]

yes I am comparing with a published article and they used GA but they didn't mention the type of mutations and crossovers.how should I find out?

and in this code which kind of mutation and crossover we are using?

[Geoff Hayes]

You could contact the author to find out what are the parameters they used for their GA. In the MATLAB code, you would be using the default crossover and mutation operators (you might find out which from Find minimum of function using genetic algorithm).

[Amir Hosseini]

thank you very much indeed dear Geoff that was really nice of you!

will you please send me an empty email to [e-mail] please?

[Geoff Hayes]

amir - unfortunately, I only correspond with MATLAB users via this forum.

[Amir Hosseini]

yes thank you that is understandable. I wanted to make an offer of working together and expand my article to publish it soon.

I would really appreciate it if you let me know in case of your willingness by personal email.

yours truly!