store values from a loop in a vector

Hi,

I have a for loop that calculates "n" values for each file. Meaning n values are calculated for file 1 and then a different n values are calculated for file 2 etc.. I just want to form arrays that contains the ith value from each of the n value. Meaning [1a, 1b,...] then [2a, 2b,...]...[na, nb,...] How would I do that?

Answer 1

[Azzi Abdelmalek]

Just creat a matrix nxm

[anna]

Yes, but how would I assign it to n vectors instead of having a matrix. A shortened version looks something like this:

for k = 1:length(xlFiles)
  col1=data(:,14);
  col2=data(:,17);
  j=length(col2);
  for i=1:j-1
      y=col1(i+1)-col1(i);
      x=col2(i+1)-col2(i);
      ratio = atand(y/x);
      vecC(k,:)=cosd(ratio)
  end
end

This is what I put for vecC but I really want vecC to be 1xk vectors of the ith "ratio" from each file.

[Azzi Abdelmalek]

Maybe you want to change vecC(k,:)=cosd(ratio) to

vecC(k,i)=cosd(ratio)

[anna]

yeah I did that before...putting vecC(k,i)=cosd(ratio) but then it seems to repeat it n times for each file...giving n vecC arrays for each file

[Azzi Abdelmalek]

But you have to read the data from each file, this does not appear in your code

[anna]

yes, sorry, i shortened it but there is a part where I read each file with the loop with k indices. xLfiles=dir(myFilePattern)

[Azzi Abdelmalek]

for k = 1:length(xlFiles)
  %read data from files
  y=diff(data(:,14)');
  x=diff(data(:,17)');
  ratio = atand(y./x);
  vecC(k,:)=cosd(ratio)
end