Divide a data set into sub data sets

12 vues (au cours des 30 derniers jours)
dav
dav le 26 Sep 2013
Commenté : DGM le 25 Juil 2022
Hi,
I am running a simulation program.
There, in every simulation run it creates a data set of size T. I would like to know if there's a loop I can use to divide this data set into 20 sub data sets of equal size and randomly choose a data set, among the 20 sub data sets, to be used in a different pat of the program.
any help is greatly appreciated.
Dav.
  1 commentaire
DGM
DGM le 25 Juil 2022
@Mehri Mehrnia's question-as-answer moved here:
Hi,
I read all Q&As, but I have another question:
I have a big data set, due to the algorithim, I have a vector with a size in milions so Matlab is not responsive.
what is an efficient way to divide this data to smaller parts that Matlab can handle it?
In fact, it should be unbiased data segmentation

Connectez-vous pour commenter.

Connectez-vous pour répondre à cette question.

Réponse acceptée

Azzi Abdelmalek
Azzi Abdelmalek le 26 Sep 2013
A=1:100 % Example
data=reshape(A,[],20) % each column represent your part of data
id=randi(20)
random_vector=data(:,id)
  5 commentaires
Afficher 3 commentaires plus anciens
dav
dav le 27 Sep 2013
thank you very much!
Khan Engr
Khan Engr le 25 Sep 2018
Modifié(e) : Khan Engr le 25 Sep 2018
I have similar type of question with one step ahead to ask;
If I have a data set 'A' of 50000 samples (sampling time 1e-4sec) and want to divide this data set into small data sets, each small data set having 100 samples. And then have them in the form such as; A1, A2, A3, ....A500, so that I can use them further. (the small data sets are in a sequence such as A1= A(1:100), A2=A(101:200), A3=A(201:300), ..... A500)
I Will be grateful for kind help.

Connectez-vous pour commenter.

Plus de réponses (1)

Jan
Jan le 27 Sep 2013
The question is not clear. You have T "data sets" (what ever this mean) and want to divide it in 20 "sets" of equal size. Is T dividable by 20? Should the new data sets contain repetitions, e.g. is this allowed:
aNewDataSet = [T(1), T(1), T(3:end)]
Should the new data sets be elementwise distinct or is this allowed:
newDataSet(1) = [T(1), T(3:10)]
newDataSet(2) = [T(1), T(4:11)]
When only one data set is used afterwards, why creating 20 of them at first?

Catégories

En savoir plus sur Loops and Conditional Statements dans Help Center et File Exchange

Tags

Community Treasure Hunt

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

Start Hunting!

Translated by