How to create a vector?

18 visualizzazioni (ultimi 30 giorni)
Sim
Sim il 16 Ott 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.

Risposta accettata

Babak
Babak il 16 Ott 2012
Modificato: Babak il 16 Ott 2012
vector=[];
for j=1:n
% find newone that comes from file(j)
vector = [vector , newone]
end
  2 Commenti
Sim
Sim il 16 Ott 2012
Thank you veru much
Matt Kindig
Matt Kindig il 16 Ott 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

Accedi per commentare.

Più risposte (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by