Processing files using a for loop

Question

Matt 2012-2-21

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/29837-processing-files-using-a-for-loop

评论： Walter Roberson 2021-9-10

I am trying to write a program to read in files and analyze each file one by one. The files are wav files, and I want to read them in, filter them with a filter I have already designed, plot frequency vs. time and do a spectrogram of each file. I am supposed to use uigetdir to find the directory of files I want to read into MATLAB, and then analyze each one, hopefully with a 'for loop'. I'm not too advanced, so this may be easy and I'm just missing how to do it. Any help would be appreciated.

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Answer 1

Walter Roberson 2012-2-21

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/29837-processing-files-using-a-for-loop#answer_38249

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

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Answer 2

Kevin Holst 2012-2-21

16
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/29837-processing-files-using-a-for-loop#answer_38248

在 MATLAB Online 中打开

something like this:

myDir = uigetdir; %gets directory
myFiles = dir(fullfile(myDir,'*.wav'); %gets all wav files in struct
for k = 1:length(myFiles)
  baseFileName = myFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
  [wavData, Fs] = wavread(fullFileName);
  % all of your actions for filtering and plotting go here
end

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Deepu S S 2021-9-10

在 MATLAB Online 中打开

i'm also working on the above shown code. I'm facing some problems .Actually my aim is to read and plot all file ina single axis or subplots. please help me

                              function CHD_Multiview_Callback(hObject, eventdata, handles)
set(handles.chdprevious, 'Visible','on')
set(handles.chdnext,'visible','on')
set(handles.chdtext,'visible','on')
set(handles.chdpanel,'visible','on')
guidata(hObject, handles);
disp('Entered');
guidata(hObject, handles);
folder_name = uigetdir('','Select src data Directory'); 
if isequal(folder_name,0)
   disp('Directory Selected');
else
%     set(handles.EEGFilename,'string','Wait Loading File.......');
disp(['You have  selected  ', fullfile(folder_name)]);
disp('CHD Audio file processing wait')
handles.srcFolder= fullfile(folder_name);
% set(handles.edDirName,'string',handles.srcFolder);
end
guidata(hObject, handles);
% Specify the folder where the files live.
k='';
myFolder = 'F:\audio';
folder ='F:\';
%     AudioArray{k} = audioread(fullfile(folder));
%     maxaudio(k) = max(AudioArray{k});
% myFolder = 'F:\audio';
% Check to make sure that folder actually exists.  Warn user if it doesn't.
if ~isfolder(myFolder)
    errorMessage = sprintf('Error: The following folder does not exist:\n%s\nPlease specify a new folder.', myFolder);
    uiwait(warndlg(errorMessage));
    myFolder = uigetdir(); % Ask for a new one.
    if myFolder == 0
         % User clicked Cancel
         return;
    end
end
% Get a list of all files in the folder with the desired file name pattern.
filePattern = fullfile(myFolder, '**/*.wav'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
for k = 1 : length(theFiles)
    baseFileName = theFiles(k).name;
    fullFileName = fullfile(theFiles(k).folder, baseFileName);
    fprintf(1, 'Now reading %s\n', fullFileName);
%     fdispf(1,'Now ploting chd %s\n',fullfile);
    % Now do whatever you want with this file name,
    % such as reading it in as an image array with imread()
    AudioArray = audioread(fullFileName);
%      [y,fs] = audioread(fullFileName);
%      subplot = 'theFiles';
 
end

In this for loop i want tyo add function to plot all readed audio files .So guys please help me to solve this issue...............

Deepu S S 2021-9-10

编辑：Walter Roberson 2021-9-10

在 MATLAB Online 中打开

surf(A,,'edgecolor','none');

why using this function i'm very new to MATLAB

Walter Roberson 2021-9-10

在 MATLAB Online 中打开

Compare:

A = sort(randi([-2 9], 300, 500));

surf(A)

title('edgecolor default')

figure

surf(A, 'edgecolor', 'none')

title('edgecolor none')

Notice that the first of the two surface plots is nearly completely black, but the second of them, with edgecolor none, looks fine.

The difference is that in the first one, all the edges have been drawn in black. But edges have fixed drawing width: if you draw an edge and then zoom the plot in or out, the edge stays the same thickness on the screen. When you have enough data that the view has to zoom out to look at it all, then the data coordinates get squished together compared to physical drawing coordinates, so the data coordinates at which the edges get drawn get closer together, but the width of the edges stays the same. At some point, the edges are pretty much touching, and all you can see is the edges.

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