For loop not working

I have a 2x4 matrix called A. I would like to find the sum of each column and divide each element in that column with the sum of that column. However, when I run the loop, the first 3 columns have no values in them. How do I rectify this? The following is my code:

A = rand(2,4)

for i=length(A)

B(:,i) = A(:,i)./sum(A(:,1));

end

Answer 1

[VBBV]

A = rand(2,4)

A = 2×4

0.9006 0.7820 0.6684 0.4557 0.2964 0.9567 0.3112 0.9163

for i=1:length(A)  % using a single value 
B(:,i) = A(:,i)./sum(A(:,i));  % divide each element with sum of that column
end
B

B = 2×4

0.7524 0.4498 0.6823 0.3322 0.2476 0.5502 0.3177 0.6678

It seems you are using a single value in loop counter

[VBBV]

if you want values for first 3 columns and rows, start with 1. you also need to update

sum(A(:,1))  % this is for 1st col only

with

sum(A(:,i)  % corresponding column

[Leeba Ann Chacko]

Thank you! I can't believe I missed that. :P