MATLAB: Index exceeds the number of array elements (1). in matlab

MATLAB

%Spider Monkey Optimization Algorithm
clc;
clear;
close all;
M=4;
N=4;
SM=randi([10 50],M,N);
U=randi([0 1],M,N);
min=1;
max=10;
   for i=1:M;
       for j=1:N;
           t1=SM(i,j);
           t2=U(i,j);
           fx(:,j)=t1*(min)+t2*(t1*(max)-t1*(min));
       end
           SMij(i,:)=fx;
   end
   SMij
   
   LL=randi([5 10],M,N);
   Unew=randi([-1 1],M,N);
   for r=1:M;
       for j=1:N;
           t3=SMij(r,j);
           t4=LL(r,j);
           t5=Unew(r,j);
           fxx(:,j)=t3+t5*(t4-t3)+t5*(t3-t3);
       end
       SMNewij(r,:)=fxx;
   end
   SMNewij
   
   
   % Algorithm#1 LPL
    
   xmin=0.1;
   xmax=0.8;
   pr=xmin+rand(M,N)*(xmax-xmin);
   for k=1:M;
       for j=1:N;
           if U>=pr;       %startif
           t6=SM(k,j);   
           t7=U(k,j);
           t8=LL(k,j);
           t9(k,j)=t6+t7*(t8-t6)+t7*(t6-t6);
           else
           SMNewij=SMij;
           end             %endif
       end
   end
   
   
   
   for i=1:M;
    for j=1:N;
       xi=SM(i,j);
       t1(:,j)=(abs(xi)^2)^3;
    end
    fitnessFunction(i,:)=sum(t1,2);
   end
 fitnessFunction
 
 [val, loc] = sort(fitnessFunction)
 MinValue=min(fitnessFunction)

Best Answer

 MinValue=min(fitnessFunction)
You are probably wanting to invoke the min() function there. But you assigned min to be a variable so that is an indexing request.
Lesson of the day: do not use min or max or sum as variable names
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