# having one "for" loop instead of two

17 views (last 30 days)
Bahareh on 29 Nov 2011
Hello all,
I have two "for" loops.
for a=0:10
for b=0:10
c=a+b;
end
end
I would like two combine them and put them in one "for" loop but I have error.
for a=0:10 && b=0:10
c=a+b;
end
Can anybody help me? thanks.
##### 2 CommentsShow 1 older commentHide 1 older comment
Walter Roberson on 29 Nov 2011
You cannot iterate two variables in one "for"

Jan on 29 Nov 2011
Actually it is said already. But not explicitely:
a = 0:10;
b = 0:10;
for k = 1:length(a)
c = a(k) + b(k);
end
Walter Roberson on 29 Nov 2011
The new question that was created was http://www.mathworks.com/matlabcentral/answers/22579-surface-plot
I show how to embed the line within a surface there. It isn't a useful thing to do in this situation, but perhaps it will be useful for someone else.

Matt Tearle on 29 Nov 2011
As Walter said, you can't loop over two variables in the same for-loop. So the real question is: why do you want to do this? What's the problem with the two nested loops that you're trying to avoid/fix/solve?
Bahareh on 29 Nov 2011
In the two loop case, each value of a corresponds to 11 values of b. I wan each value of a be corresponding to one value of b; in other words, I wan a=0 be corresponding to b=0 and a=5 be corresponding to b=5?

Hin Kwan Wong on 29 Nov 2011
Your code does not make sense because it's overwriting c each time you loop it Your answer is just equal to c = last a + last b = 10+10 = 20
If you want to sum all c values: a=0:10; b=a; sum([a+b])

Walter Roberson on 29 Nov 2011
for a=0:10
b = a;
c = a + b;
end

Michael on 29 Nov 2011
From the comments I think you want the surface c = a + b
Just use a nested loop
c = zeros(11);
for a = 0:10
for b = 0:10
c(a+1,b+1) = a + b;
end
end
surf(a,b,c)

### 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!