why get this message "Array indices must be positive integers or logical values." i for loop?

I got the error message " Array indices must be positive integers or logical values"

I would appreciate any help. thanks in advance

for i = 1:0:1:600
    iNext = i + 1;   
    do...
    x(iNext) >= x(i)   % assumed "i" is the current step and "iNext" is the Next step  
    
    
end

Answer 1

[KALYAN ACHARJYA]

Yes, Matlab allows indexing for positive integer only

x=zeros(1,600); 
for i = 1:600
    iNext=i + 1; 
    x(iNext)=x(i)   % assumed "i" is the current step and "iNext" is the Next step  
end

#Pls see the iteration process and your requirements