Changing the step in a for loop

Hi! Easy question for you guys! How can i get the same output in matlab? Here's the code in c++ where the output is 0, 2, 4, 6, 8, whereas in matlab is 1 to 10. Thanks!

if true
    for (int i = 0; i < 10; i++)
  {
    cout << i << " ";
    i = i + 1;
      }
for i=0:9
  i = i+1
end
}

Answer 1

[Stephen23]

for k = 0:2:8
    ... some code here
end

Or even better would be to forget about those low-level loops like you need in C, and learn to vectorize your code. The documentation states:

Vectorizing your code is worthwhile for several reasons:

• Appearance: Vectorized mathematical code appears more like the mathematical expressions found in textbooks, making the code easier to understand.
• Less Error Prone: Without loops, vectorized code is often shorter. Fewer lines of code mean fewer opportunities to introduce programming errors.
• Performance: Vectorized code often runs much faster than the corresponding code containing loops.

Forget about low-level languages, and learn to utilize MATLAB's programming concepts.

Answer 2

[Alexandru Miculescu]

Thank you for your answer, i'll check that link.

    for i=1:nr_games
    if ( 1+fix(6*rand) ) == 6
        i=i+1; % here i want to increment the i
        if ( 1+fix(6*rand) ) == 6
            luck = luck + 1;
        end
    end

What i realy want to do is to increment manually the step when ( 1+fix(6*rand) ) == 6, because i generated myself another random number.

Answer 3

[Jos (10584)]

For-loops in matlab behave a little different than for loops in C. You might be in need of a While-loop.

for k=1:5
   disp(k)
   k = 100 ;
end

for k = [10 3 5 6]
   disp(k) ;
end

k = 1 ;
while k < 5
  k = k + 2 ;
 disp(k)
end

[Guillaume]

To follow up on Jos' answer, you need to understand that for just iterates over the columns of the vector/matrix that you give it. In C++ terms, it behaves like std::for_each on a const sequence.