How do I select files in a directory based upon day, month, and hour they were last modified or created?

Question

Benjamin Colbert 2022-9-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1801965-how-do-i-select-files-in-a-directory-based-upon-day-month-and-hour-they-were-last-modified-or-crea

评论： Walter Roberson 2022-9-9

I have data that looks like this:

data = {"month", "day", "hour", "count"; 2, 5, 12, 25; 2, 6, 12 30; 2, 9 8, 16}

I want to read that data into matlab and then search a directory for files with a modifed date which matches the date and hour within a row, runs some analysis, and then move to the next row.Note, I have some rows which are same date and hour and others which skip multiple dates so i can't just run through the files in order. I dummied up the following code as a starting point but I am sure there's a better way to do this and it falls apart if there's more than a month of data.

data = readcsv("data.csv")
f = dir('*.wav")
for i = 1:length(data)
    for n:length(f)
        Day = str2num(F(2).date(:,1:2))    
        Hour = str2num(F(2).date(:,11:12))
        if Day = data(i, 2) & Hour = data(i, 3)
            audio = audio(f.name(n))
            Do calcualtions
    End
End

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Answer 1

Walter Roberson 2022-9-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1801965-how-do-i-select-files-in-a-directory-based-upon-day-month-and-hour-they-were-last-modified-or-crea#answer_1050070

编辑：Walter Roberson 2022-9-9

在 MATLAB Online 中打开

f = dir("*.wav");
filenames = fullfile({f.folder}, {f.name});
fdt = datetime([f.datenum], 'convertfrom', 'datenum');
[~, ~, day] = ymd(fdt);
[hour, ~, ~] = hms(fdt);
day = day(:); hour = hour(:);
numfiles = length(f);
data = readmatrix("data.csv");
for i = 1:size(data,1)
    matchidx = find(data(i,2) == day & data(i,3) == hour) .';  %need row
    for n = matchidx
      audiodata = audio(filenames{n});
      Do calculations
    end
end