How do i create a loop that accesses more than one matrix?

I'm relatively new to MATLAB, but I'm trying to create a loop that runs through one column in matrix X, matches the value to another column in matrix Y, and then feeds the corrosponding values in the second and third columns of matrix Y into the second and third columns of matrix X?

I've been trying to use two for loops, however i cant get it to refence the second and thtird columns. How would i go about doing this?

Thanks!!

Answer 1

[Yoav Livneh]

Maybe try something like this

for jj = 1:size(X,1)
  % match 1st column of X to 1st column in Y
  idx = find(X(jj,1) == Y(:,1)); 
  % put 2nd and 3rd columns in Y into X
  X(idx,2) = Y(idx,2);
  X(idx,3) = Y(idx,3);
end

Hope this is what you meant.

[Kirsten du plessis]

Hi Yoav,

Unfortunately that doesnt appear to work - its still returning 0's in the X(:,2) column.

THank you though.

[Yoav Livneh]

Hmm the code seems to work fine for me. Can you print your X and Y matrices here?

By the way, I made a mistake, you should switch the last two lines to:

X(jj,2) = Y(idx,2);
X(jj,3) = Y(idx,3);

[Kirsten du plessis]

Yes thanks - i worked that out eventually :) Thanks for your help!!