%% module 4, looping

%% example -- can't change iterator during for loop

for i = 1:9
    disp(['i is ',num2str(i),', trying to change it to ',num2str(3*i)])
    i = 3*i; % don't do this (trying to change an iterator in a for loop)
end
    

%% example -- find largest number divisible with 7 and smaller than 100    

i = 1;
while i*7<100
    i = i+1;
end
disp(7*i) % this will be larger than 100 -- so condition from while does not hold

%% example -- vectorization

test = [3, 4, 8, 6, 5, 8, 3, 4, 7, 8, 8, 9, 4, 1, 3, 4, 6, 7, 9, 5, 3, 5, 7, 2, 5, 3];

hist = zeros(1,9);
for i = 1:numel(test)
    hist(test(i)) = hist(test(i))+1;
end


