2) sums the values of those elements of “x” that are lower than 26. in matlab

main.m
% sample x array
x = [10, 20, 30, 5, 25, 15];

% initialize the sum variable
sumX = 0;

% loop through the array
for i = 1:length(x)
    % check if the current element is less than 26
    if x(i) < 26
        % add the current element to the sum
        sumX = sumX + x(i);    
    end
end

% display the sum
disp(sumX);
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In the above code block, we have first initialized an array called x. We then created a variable called sumX to hold the cumulative sum of all elements in x that are strictly less than 26.

We then looped through the array using a for loop and checked each element against the condition x(i) < 26. If the element satisfied the condition, we added it to the sumX variable.

Finally, we displayed the value of sumX.