I'm trying to operate on each element of a row vector individually but unable to do so, as each element is containing a vector within itself.

I am executing the following logic:

% specify file location containing multiple .wav files %

% read all files from that location. there are 535 files. %

% convert all the .wav files into .mat files by using readall() %

% it gives numerical representation of each .wav file, giving N co-efficients for each .wav file, there are 535 such .wav files. N can be different for different .wav file. %

% the obtained .mat files is a 535X1 cell. Each cell is a different sized vector, say NX1. %

% i am trying to obtain each individual N, operate on it and then proceed further. But I am unable to do so.%

Is there a way to extract each element of the row vector and operate ono it, within a loop?

Below is the code that I tried:

clc;clear all,close all;
location = fullfile('G:\Mtech_2nd\Minor Project\EMODB_535_folders_final\EMODB_535_folders_final');
ads = audioDatastore(location,'IncludeSubFolders',true,...
    'LabelSource','foldernames'); % obtains file location containing .wav files
allsignals = readall(ads); % converts .wav to .mat files, giving 'allsignals' as a 535X1 cell
X = [];
for k=1:535
    X = [X allsignals(k)]; %want to operate on each element of this vector
        %Y = emd(X,'Interpolation','pchip','Display',1);
end

[Dyuman Joshi]

To access individual cell elements use {}, allsignals{k}

Also, Do you want to operate on an element only, or something else?

[Utsav Pandya]

Thank you. I want to do two things: (1) get the size of each element as a number and put an upper limit to that number, i.e. the number upto which the elements of each cell will go. (2) extract features of each element and process it further. I have an idea of executing these two, but was not able to get started. I will try the method you suggested.

[Dyuman Joshi]

You can use cellfun or a loop with numel as @DGM mentioned in their answer. But since you want to process of each element further, a loop will be a better option. use allsignals{k} to extract an element

Answer 1

[DGM]

I think what you're asking is to get the number of elements for each vector within the cell array. You can do that either with a loop or with cellfun().

% sample array
cellofvecs = { (1:3) (1:10) (1:100)};

% with cellfun
N1 = cellfun(@numel,cellofvecs)

N1 = 1×3

3 10 100

% with a loop
N2 = zeros(size(cellofvecs));
for k = 1:numel(cellofvecs)
    N2(k) = numel(cellofvecs{k});
end
N2

N2 = 1×3

3 10 100