looping through total size and calculating standard deviation of each frame.

I want my loop to run from 1 to length of x. x contain total 67000 frames and I want that my code loop through each frame at a time and calculate the standard deviation of each frame from 1 to length of x.

folder = fullfile('C:\Users\vvb\Documents\datset\local');
ADS = audioDatastore(folder);
x=read(ADS);
[row,c]=size(x);
 for j=1:x
       totalframes(j)=j;
local=totalframes;
stdX=std(local);      
 end

So basically 'x' contains total 67000 frames and I want to loop through each frame of 'x' and calculate the standard deviation of each frame. I have written the above code but its not working.

Answer 1

[Ameer Hamza]

I don't have the audio toolbox, but something like this will work

folder = fullfile('C:\Users\vvb\Documents\datset\local');
ADS = audioDatastore(folder);
stdX = [];
while hasdata(ADS)
    x = read(ADS);
    stdX(end+1) = std(x);
end

[Ralph]

This is not working I want my loop to run x number of times starting from 1 to length and store each value of x in a variable name local and than compute the standard deviation of each frame.

[Ameer Hamza]

This code runs on all the frames in ADS. Is there any error? If you want to store all the signals too then try something like this

folder = fullfile('C:\Users\vvb\Documents\datset\local');
ADS = audioDatastore(folder);
x = {};
stdX = [];
while hasdata(ADS)
    x{end+1} = read(ADS);
    stdX(end+1) = std(x);
end