How to find the index of the variable in my For Loop when a condition is met

I wrote code that itterates element by element of the array 'nr'. Nr has 1000 random numbers. I want to display when two of those random numbers are of the same value, and adjacent. I think that works. I then tried to find the index of the value when it meets the condtion, but it doesnt work. I'm pretty stuck, does anyone have any tips?

for i = 1:length(nr)
    
    if (nr(i)==nr(i+1)) %if a element in the array nr is equal to the 
        % element above it, then it meets the condition
        fprintf("%d is adjacent to a number of equal value", i)
        find(nr == i)
    end
    
     if i == 1000
         break
     end
end

Answer 1

[Asad (Mehrzad) Khoddam]

[~,ind] = find(diff(nr)==0)
% print indices
for i = ind
   fprintf("%d is adjacent to a number of equal value\n", i) 
end

Answer 2

[Asad (Mehrzad) Khoddam]

Use

 [nf, ind] = find(nr == i);
 

ind contains the index with the given condition

[Serena Simpson]

Thanks! But how can I then output/display what thoes indicies are? I tried disp(nf), but it didnt work.

[Asad (Mehrzad) Khoddam]

inseat of loop use:

[~, ind] = find(diff(nr)== 0);
disp(ind)