Replacing elements in arrays

I have an array of 39 elements consisting of only two digits. Every time I start the program, these two digits change. I give an example:

Run 1: array = [25 25 25 26 25 26 26 26 26 ....]

Run 2: array = [22 22 29 22 29 29 22 29 29 ....]

I need to replace the smallest number with "-1" and the largest number with "1".

I did it this way with a loop and I am asking if this seems correct (to me is correct because it works) and if it can be done "better" than this:

array_replaced = zeros(1,39);

for i=1:length(array)
    
    if ii == 39
        if array(i) < array(i-1)
            array_replaced(i) = -1;
        else array_replaced(i) = 1;
        end
        
    else
        if array(i) < array(i+1)
            array(i) = -1;
        else array(i) = 1;
        end
    end
end

Thanks!

Answer 1

[Star Strider]

I am not exactly certain what you want to do, what the nubmers are, or if you only want to replace one or all that meet the criteria.

Possibly these —

array = randi([21  29], 1, 10)                                  % Create Vector

array = 1×10

28 27 23 22 26 26 25 25 27 24

array(array==min(array)) = -1

array = 1×10

28 27 23 -1 26 26 25 25 27 24

array(array==max(array)) = +1

array = 1×10

1 27 23 -1 26 26 25 25 27 24

.

Answer 2

[Mrutyunjaya Hiremath]

Here is a more straightforward way to replace the smallest and largest numbers in the array using MATLAB's built-in functions min and max.

% Sample array
array = [25, 25, 25, 26, 25, 26, 26, 26, 26];  % Replace with your actual array

% Find the minimum and maximum values in the array
minVal = min(array);
maxVal = max(array);

% Replace the minimum values with -1 and the maximum values with 1
array(array == minVal) = -1;
array(array == maxVal) = 1;

disp(array);

    -1    -1    -1     1    -1     1     1     1     1