Error in matlab codes

Hi everyone,

I write following codes:

clear all

close all

clc

% Define the details of the problem

nVar = 4;

ub = [10 10 10 10];

lb = [-10 -10 -10 -10];

fobj = @ObjectiveFunction;

% Define the SFA's paramters

noP = 20;

maxIter = 50;

% The SFA algorithm

% Initialize the Fish position and food

for k = 1 : noP

Swarm.Fish(k).X = (ub-lb) .* rand(1,nVar) + lb;

FishFitness = Swarm.Fish(k).X;

Swarm.Fish(k).Fitness = fobj(FishFitness);

Swarm.Food(k).X = zeros(1,nVar);

Swarm.Food(k).Fitness = inf;

end

[sorted_fish_fitness,sorted_indexes]=sort(FishFitness);

for newindex=1:noP

Sorted_fish(newindex)=[Swarm.Fish.X(sorted_indexes(newindex))];

end

Swarm.Food.X=Sorted_fish;

Swarm.Food.Fitness=sorted_fish_fitness;

When I run it it shows following error

Expected one output from a curly brace or dot indexing expression, but there were 20 results.

Error in SFA (line 28)

Sorted_fish(newindex)=[Swarm.Fish.X(sorted_indexes(newindex))];

kindly help me to solve this problem.

Answer 1

[Image Analyst]

Try getting rid of the brackets, which concatenate all the values from all the structures into a single array of 20 values, which can't go into a single index of Sorted_fish.

Sorted_fish(newindex) = Swarm.Fish.X(sorted_indexes(newindex));

[Usman Taya]

Thank you for answer but after removing brackets it shows following error

Expected one output from a curly brace or dot indexing expression, but there were 20 results.

Error in SFA (line 28)

Sorted_fish(newindex)=Swarm.Fish.X(sorted_indexes(newindex));