easy and efficient way to create cell array or table from csvs or existing variables

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$Amit Ifrach$

Amit Ifrach 2021-10-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1561141-easy-and-efficient-way-to-create-cell-array-or-table-from-csvs-or-existing-variables

评论： Mathieu NOE 2021-10-13

לק"י

Hello!

I want to know if there an easy way (may be GUI) or other command to creat one table or cell array from several CSV files or several variables.

Here is an example:

I got several CSV files which in each one I need only 2 columns (lets asume colums C and D):

I want an easy way to creat one cell array from several csvs such as the above.

Furthermore, the extracted vectors above should be as it is (2d vector) in specific cell just for it. for each 2d vector new row (cell) should be created in the cell array, such as this:

Further more, lets assume I have several var's loaded to the workspace:

is there an easy fast way to combine several of these into a table in the same fashion as mentioned above?

thank you very very much!

Amit.

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Answer 1

Mathieu NOE 2021-10-11

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https://ww2.mathworks.cn/matlabcentral/answers/1561141-easy-and-efficient-way-to-create-cell-array-or-table-from-csvs-or-existing-variables#answer_806146

在 MATLAB Online 中打开

hello

this is my 2 cents suggestion

clc
clearvars
%% first section : CSV file management
fileDir = pwd;
% Sorting filenames in natural order 
fileNames = dir(fullfile(fileDir,'*.csv')); % get list of data files in directory
fileNames_sorted = natsortfiles({fileNames.name}); % sort file names into order (https://fr.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort)
M = numel(fileNames_sorted);
% Import each file using it's filename
for k = 1:M
    
    tmp = readcell(fullfile(fileDir, fileNames_sorted{k}));
    % select columns
    cols = (3:4);
    name1{k,1} = ['2d vector from CSV ' num2str(k)];
    data1{k,1} = tmp(:,cols);
    
end
% export as table or cell array
out_table1 = table(name1,data1);
out_cell1 = table2cell(out_table1);
%% second section : save workspace data
S = who();
for k = 1:numel(S)
    
    name2{k,1} = S{k};
    data2{k,1} = eval(char(name2{k,1})); % eval not recommended even if it works here 
    
end
% export as table or cell array
out_table2 = table(name2,data2);
out_cell2 = table2cell(out_table2);
        
        