Difference between randi(1,M) and randi() in for loop

Are there any difference between A and B?

randi(1,M);

and

for k=1:M
  randi(1,1);
end

[Azzi Abdelmalek]

Your question is not clear. Your for loop doesn't do anything

Answer 1

[Sebastian Castro]

Results-wise, there is no difference. Both snippets of code below generate a 5-element vector of random numbers between 1 and 10.

To get equivalent results, I am forcing the random number generator seed to be 0 using rng.

% Single command
rng(0)
x = randi(10,1,5)
  x =
     9    10     2    10     7

vs.

% for-loop
rng(0)
x = zeros(1,5);
for k=1:5
  x(k) = randi(10);
end
x
  x =
     9    10     2    10     7

Now, the recommended way is to use the single command because it's likely more optimized than the brute-force for-loop approach. This will become apparent especially if you're generating large matrices.

tl;dr use a single command. It's the same and the syntax is both easier and faster.

- Sebastian

[Nancy Chen]

Thank you so much! The answer is clear. :)