MATLAB: Updating with for-loop (straightforward)

Question

 AA =
       2     8     4.........
       4     9    34.........
BB =
     4     5     2.........
     9    23    11.........
dt = 0.1    % time step
for t = 0:dt:4
   pA = AA(:, t+1)
   pB = BB(:, t+1)
end

There are several other columns for AA and BB. At t = 0, I need to assign the first columns of AA and BB to pA and pB respectively. At t = 0.1, the second columns. At t = 0.2, the third columns and so on.

I know the error is in AA(:, t+1) and BB(:, t+1) because t is in decimals and column numbers cannot be in decimals. I just don't know how to rectify it.

Answer 1

Hello Fiona,

One way is to use an index to address AA and BB and to calculate t. You have 41 possible values for t, so

for n = 1:41
   pA = AA(:,n)
   pB = BB(:,n)
   t = .1*(n-1);    % relationship between n and t
   (possibly more calculations involving t inside the loop are here)
end

pA and pB change every time in the loop and are not being saved, so I assume you are doing some calculation with them inside the loop.