i have problem using feval function

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arudhra
arudhra 2014-12-19
回答： Geoff Hayes 2014-12-19
>> x(1:7) = randi([4,50],1,7);
d(1:7) = randi([3,5],1,7);
for i = 1 : 7
sum = 0;
w = 1;
sum = sum + w*(x(i) - d(i));
end
f(1) = sum;
for i = 1 : 7
sum = 0;
sum = sum + w*(x(i) - 4);
end
f(2) = sum;
f = f(1) + f(2);
>> a = Particle_Swarm_Optimization (10,2,[4 50;3 5],f,randi(100,50),2,2,2,0.4,0.9,3);
Completed 0 % ...Error using feval
Argument must contain a string or function_handle.
Error in Particle_Swarm_Optimization (line 103)
availability(p,itr)=feval(Food_availability,parameter);

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回答（1 个）

Geoff Hayes
Geoff Hayes 2014-12-19
Arudrha - according to the documentation for the PSO at the FEX Particle Swarm Optimization, the fourth input parameter must be a function of one variable. Pramit Biswas' example is of a function that accepts an array input as
function f = funfunc(array)
a=array(1);
b=array(2);
f = a+b ;
end
In your code, you are not passing a handle to a function but are instead passing the scalar value f.

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