having one "for" loop instead of two
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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 Comments
Accepted Answer
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
4 Comments
Matt Tearle
on 29 Nov 2011
This doesn't make sense, though. Your whole point was that you wanted to evaluate c at the same values of a and b, not at every combination of a and b. So you're not making a surface -- you're making a line (along the diagonal in a-b space). In other words, you don't have c(0,7) or c(3,2) or ..., which you need to make a surface. All you have is c(0,0), c(1,1), c(2,2), etc.
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.
More Answers (4)
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?
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])
0 Comments
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)
0 Comments
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