Convert time to datenum

Question

Daniel Boateng 2019-3-25

0
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https://ww2.mathworks.cn/matlabcentral/answers/452191-convert-time-to-datenum

评论： Guillaume 2019-3-25

I have a folder with 10 matfiles where the first row is the time and the second raw is some data associated with the time. I want to convert all the time for the first row of each of the matfiles as a new time series using datenum. I have been able to navigate to the directory of and tried this code but it isnt working. Please is can I get some help.

mat = dir('*.mat');

for i = 1:length(mat)

load(mat(i).name);

newMat = mat(i).name(1,:);

newdate = datenum(newMat);

end

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Guillaume 2019-3-25

Why not use datetime instead of datenum? It's more flexible and more reliable.

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Answer 1

Stephen23 2019-3-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/452191-convert-time-to-datenum#answer_367237

编辑：Stephen23 2019-3-25

在 MATLAB Online 中打开

It is not required to navigate to data directories to read data:

D = 'Path of the directory where the MAT files are saved';
S = dir(fullfile(D,'*.mat')); 
for k = 1:numel(mat) 
    T = load(fullfile(D,S(k).name));
    M = T.nameOfTheVariableInMatFileWhichYouHaveNotToldUs;
    newdate = datenum(M(1,:));
end

Or, assuming that the .mat files contain only one variable:

D = 'Path of the directory where the MAT files are saved';
S = dir(fullfile(D,'*.mat'));  
for k = 1:numel(mat) 
    T = load(fullfile(D,S(k).name));
    C = struct2cell(T);
    newdate = datenum(C{1}(1,:));
end