Stop for loop if F <= 0

14 views (last 30 days)
Malcolm Taylor Hansen
Malcolm Taylor Hansen on 7 Oct 2015
Answered: Walter Roberson on 7 Oct 2015
I wonder how it is possible to stop a for loop without using break. I have tried to expand the code with a while loop, but I do not manage to get it to work. Appreciate hints.
n = 20;
terskelverdi = 0.1;
F = zeros(1,n);
F(1) = 1;
F(2) = 1;
for k = 3:n
r = rand(1);
if r > terskelverdi
F(k) = F(k-1) + F(k-2);
else
F(k) = F(k-1) - F(k-2);
end
end
disp(F)
figure, plot(F,'g-'), grid
title('Fibonaccitall med tilfeldigheter opp til "n"')
  1 Comment
Mohammad Abouali
Mohammad Abouali on 7 Oct 2015
just curious, Why you don't want to use break?

Sign in to comment.

Accepted Answer

Walter Roberson
Walter Roberson on 7 Oct 2015
To stop a "for" loop without using "break", you can do one of:
  • reach the natural end of iterations for the loop
  • "return" to a calling routine
  • "error" out to an enclosing try/catch (or the command line)
  • quit or exit MATLAB

More Answers (1)

Jon
Jon on 7 Oct 2015
Edited: Jon on 7 Oct 2015
Why are you opposed to using break? If you mean that you want to redraw a random number if F <=0, you could do something like this:
count = 3;
while 1
r = rand(1);
if r > terskelverdi
F(count) = F(count-1) + F(count-2);
else
F(count) = F(count-1) - F(count-2);
end
if F(k) > 0
count = count + 1;
end
if count == n
break
end
end
but this could cause an infinite loop. Not sure what your objective is, so I can't help more.

Categories

Find more on Loops and Conditional Statements in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!