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

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Ralph 2020-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/592534-looping-through-total-size-and-calculating-standard-deviation-of-each-frame

评论： Ameer Hamza 2020-9-12

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.

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Answer 1

Ameer Hamza 2020-9-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/592534-looping-through-total-size-and-calculating-standard-deviation-of-each-frame#answer_493447

在 MATLAB Online 中打开

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

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Ralph 2020-9-12

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 2020-9-12

在 MATLAB Online 中打开

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