arrange file length matlab

hello everyone

I got some files that has a length 20000 cell and the others are shorter then 20000 . I want to make these short files to complete the set of cell 20000 with replacing the missing with ones or zeros .

and am using this code to read the files

   for k = 1:numfiles 
  myfilenames = sprintf('a%d.wav', k);

[mydata{k}, myfs{k}] = audioread(myfilenames,[1,2000]);  

 end

[Jan]

What is the purpose of "[1, 2'000]"? You mention "20'000" also. Is this a typo? What does "cell" mean? Remember that cell is a specific type of array in Matlab. Replacing with "ones or zeros" - please decide this by your own. What does "make these files to complete" mean? Do you want to create files with a standard length or does the question concern the arrays in Matlab only?

Answer 1

[Jan]

Maybe:

for k = 1:numfiles 
  File = sprintf('a%d.wav', k);
  [signal, myfs{k}] = audioread(File);  
  if size(signal, 1) < 20000  % Pad signal with zeros
    signal(20000, :) = 0;
  end
  mydata{k} = signal;
end

Usually "data" is a sufficient name already, while "mydata" is a tiny overkill - of course these are your data ;-) Especially "myfilenames" is confusing to specify one file.

[sam aldoss]

thanks man you really save me

Answer 2

[KSSV]

A{1} = rand(50,1) ;
A{2} = rand(40,1) ;
A{3} = rand(60,1) ;

L = max(cellfun(@length,A)) ;  % get maximum length 
iwant = cell(size(A)) ;
for i = 1:length(A)
    iwant {i} = zeros(L,1) ;
    iwant{i}(1:length(A{i})) = A{i};
end

[sam aldoss]

no this code does not work

[KSSV]

Why?

[Jan]

@sam aldoss: "does not work" is a weak description of the occurring problem. Please share all information you have to make it as easy as possible to help you. The need to guess the details is not useful. Thanks.

[Jan]

@KSSV: cellfun('length', C) is more efficient than cellfun(@length, C).