MATLAB: Tell the what is “I” represents and explain by seeing the code

matlab gui

I need to know the what "I" represents in this program and how they are getting that value explain me clearly please… in program ("[fmin,I]=min(Fitness);") this part
 function [best,fmin]=bat_algorithm(para)  
if nargin<1,  para=[5 2 0.5 0.5];  end
n=para(1);
d=10; 
Lb=-2*ones(1,d);
Ub=2*ones(1,d);
for i=1:n,
Sol(i,:)=Lb+(Ub-Lb).*rand(1,d);
Sol
Fitness(i)=Fun(Sol(i,:));
Fitness
end
[fmin,I]=min(Fitness);
[fmin,I]
I
best=Sol(I,:);
I
best
function z=Fun(u)
% Sphere function with fmin=0 at (0,0,...,0)
z=sum(u.^2);
z

Best Answer

Quoting the documentation for the command MIN:
[C,I] = min(...) finds the indices of the minimum values of A, and returns them in output vector I. If there are several identical minimum values, the index of the first one found is returned.
So you get an index. Example code
A=[2 4 3 5 2]
[x,y]=min(A)
2 is the smallest content. y is index 1 then.
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