How to create a vector?

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Sim
Sim on 16 Oct 2012
Hello everyone, Suppose with a for loop I get an array for each file (array could be of different lengths for each file). I want to get a column vector which will be merging of these arrays. So all the values of arrays from each file will be in this huge vector. Thank you for you help in advance.

Accepted Answer

Babak
Babak on 16 Oct 2012
Edited: Babak on 16 Oct 2012
vector=[];
for j=1:n
% find newone that comes from file(j)
vector = [vector , newone]
end
  2 Comments
Matt Kindig
Matt Kindig on 16 Oct 2012
Keep in mind that if this is a "huge vector", then it might be rather slow due to a lack of memory pre-allocation. I would recommend something like this:
% vector is output from file(j)
r = size(vector,1);
Vector = NaN(r,n); %this is the pre-allocation step-- very important for memory management/efficiency!
Vector(:,1)=vector;
for j=2:n,
%newone comes from file(j)
Vector(:,j) = newone;
end

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