Index Vector in MATLAB

How do I index a vector in a for loop? I should be able to call the first entry of the vector a with a(1); however, I get an error when I have this as my for requirement. The error says unbalanced or unexpected parenthesis.

Here is a simplified version of my code.

a = [1 2 3]; b = [4 5 6];
for a(1) AND b(1);
    suma = a + 1;
    sumb = b +1;
end

Answer 1

[Star Strider]

I do not understand what you want to do.

One of these should work:

a = [1 2 3]; b = [4 5 6];
for k = 1:min([numel(a) numel(b)])
    suma = a(k) + 1;
    sumb = b(k) + 1;
end

or:

suma = 0; sumb = 0;
for k = 1:min([numel(a) numel(b)])
    suma = a(k) + suma;
    sumb = b(k) + sumb;
end

or:

suma = sum(a);
sumb = sum(b);

or maybe something else ...

[Justine Schneider]

Thank you. This answer seems to be in the right direction.

What is the min in:

for k = 1:min([numel(a) numel(b)])

[Justine Schneider]

... from your first MATLAB code answer.

[Star Strider]

That simply prevents the index from reading a shorter vector beyond the number of elements it has. (Here, they are both the same size.)