Create an Array of vectors within a for loop
4 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Nick Costner
le 19 Nov 2019
Commenté : Nick Costner
le 19 Nov 2019
Hello
I am a student, i was given a vocal signal of 5000x1 which i need to get it's power spectral density using pwelch function. The frequency of the signal changes over time . So i was told to cut it into 50 segments of 100 points and use the pwelch function on each of these segments.So that at the end i can plot the frequencies i got from every segment as a function of time.
The issue i get is in the syntax , i tried this :
for j=0:100:5000;
i=[1:50];
[PXX(i),F(i)]=pwelch(data(1+j:100+j),20,4,2^13,1000);
end
but i get this as a result "In an assignment A(I) = B, the number of elements in B and I must be the same."
I know that the output of the pwelch function are two column vectors of nx1 size.What i want to do is to create 50 elements of nx1,only i dont know how to write it.
0 commentaires
Réponse acceptée
James Tursa
le 19 Nov 2019
Modifié(e) : James Tursa
le 19 Nov 2019
If you want to store the column vectors, you could use cell arrays. E.g.,
k = 1;
for j=0:100:5000;
:
[PXX{k},F{k}]=pwelch(data(1+j:100+j),20,4,2^13,1000);
k = k + 1;
Then downstream in your code you can use the curly brace { } syntax to get at the column data.
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Spectral Estimation dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!